{"title":"Audio Amateur Magazine","description":"\u003cp\u003eArchive issues of the magazine title \"Audio Amateur\"\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTake a fascinating journey into the first decade of Audio Amateur's rich DIY audio history. You'll find interesting projects for a variety of audio components, articles by Ed Dell, interviews with some of the 'founding fathers' of hi-fi, and company visits--including a look at kit giant, Heathkit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/AudioAmateur-Covers.jpg?v=1764183877\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"the-audio-amateur-1970-79","title":"The Audio Amateur : 1970-79","description":"\u003cp\u003e\u003cspan\u003eThe entire collection of issues of The Audio Amateur from the 1970s is archived in PDF format. \u003cstrong\u003eIncludes issues from 1970 through 1978 which are no longer available in printed form. \u003c\/strong\u003eDigital archive access allows for online flipbook viewing or downloading of the PDF file. (Access info is provided via email within 2 business days)  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTake a fascinating journey into the first decade of Audio Amateur's rich DIY audio history. You'll find interesting projects for a variety of audio components, articles by Ed Dell, interviews with some of the 'founding fathers' of hi-fi, and company visits--including a look at kit giant, Heathkit. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca rel=\"noopener\" href=\"https:\/\/www.calameo.com\/kck-media\/read\/0053543535844591d4eda?authid=fvMxTIOivobx\" target=\"_blank\"\u003eClick Here to view the complete TOCs\u003c\/a\u003e \u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSample table of contents - The Audio Amateur Issue 2\/1970\u003c\/strong\u003e\u003cbr\u003e“Ives, Moog, \u0026amp; Fidelity”...... page 2\u003cbr\u003eEditorial by Edward T. Dell, Jr.\u003cbr\u003e“L-C\/H-Q, Mark I, Pt. 1”...... page 3\u003cbr\u003eBy Peter J. Baxandall\u003cbr\u003e“HEATH: King Kitmaker” .... page 9\u003cbr\u003eBy the Editor\u003cbr\u003e“Play Them Above the\u003cbr\u003eDust” ................................ page 12\u003cbr\u003eBy Percy Wilson\u003cbr\u003e“Price, Time \u0026amp; Value” ...... page 13\u003cbr\u003eBy Amateur\u003cbr\u003e“A Bulk Tape Eraser” ........ page 16\u003cbr\u003eBy the Editor\u003cbr\u003e“Learning to Use Transistors,\u003cbr\u003ePt. 1” ................................ page 18\u003cbr\u003eBy C. N. G. Matthews\u003cbr\u003eBenchmarks ...................... page 20\u003cbr\u003eLetters .............................. page 21\u003cbr\u003eJust Looking, thanks ........ page 23\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"audioXpress","offers":[{"title":"Default Title","offer_id":15522123350134,"sku":"AA-PDFAA070S","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/AudioAmateur-Covers.jpg?v=1764183877"},{"product_id":"modifying-the-marantz-7c-audio-amateur-1-1981-article-pdf","title":"Modifying the Marantz 7C (Audio Amateur 1\/1981 Article PDF)","description":"\u003cp\u003eModifying the Marantz 7C or St. Pooge and The DRIAAGON\u003c\/p\u003e\n\u003cp\u003eThis article is from: Audio Amateur 1\/1981 \u003c\/p\u003e\n\u003cp\u003eImmediate download of PDF upon purchase\u003c\/p\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":43969343783126,"sku":"AA-1-81-Jung","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/products\/1-1981-Marantz.jpg?v=1674614507"},{"product_id":"conversations-with-peter-baxandall-audio-amateur-12-1979-1-1980-article-pdfs","title":"Conversations with Peter Baxandall (Audio Amateur 12\/1979 \u0026 1\/1980 Article PDFs)","description":"\u003cp\u003eThis 2-part article is from: Audio Amateur 12\/1979 \u0026amp; 1\/1980 \u003c\/p\u003e\n\u003cp\u003eImmediate download of PDF upon purchase\u003cbr\u003e\u003cbr\u003eInterview Article with Peter Baxandall - he was 58 at the time\u003cbr\u003e\u003cbr\u003ePeter J. Baxandall (August 11, 1921 – September 8, 1995) was an English audio engineer and electronics engineer and a pioneer of the use of analog electronics in audio. He is probably best known for what is now called the Baxandall tone control circuit.\u003cbr\u003e\u003c\/p\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":44403750830294,"sku":"AA-12-79-Baxandall","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/AA-4-1979-pp12-17_Page_1.jpg?v=1691416277"},{"product_id":"audio-amateur-2-1984-pdf","title":"Audio Amateur 2\/1984 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1984 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eARTICLES\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[\u0026amp;\u0026gt;li]:custom-bullet pl-[18px] rtl:pr-[18px]\"\u003e\n\u003cli\u003eCONVERT YOUR TURNTABLE TO BELT DRIVE\u003cbr\u003eBy\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=J.L.%20Markwalter\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eJ.L. Markwalter\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 7\u003cbr\u003e\u003cspan\u003eThis article offers a practical and cost-effective method to upgrade older idler-driven turntables to belt drive. It includes a historical perspective on turntable designs and detailed instructions on selecting and installing a synchronous motor and belt drive system to improve performance and reduce noise.\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHIRD-GENERATION MOSFETS: THE DC 100 (PART II)\u003cbr\u003eBy\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=Erno%20Borbely\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eErno Borbely\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 13\u003cbr\u003e\u003cspan\u003eContinuing from a previous installment, this article explores the design and power-supply details of a 100W MOSFET amplifier using third-generation MOSFETs. It provides technical insights into the amplifier’s circuitry, focusing on stability, performance, and component selection.\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eA HIGH-VOLTAGE, LOW-Z REGULATOR\u003cbr\u003eBy\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=Christopher%20Paul\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eChristopher Paul\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 25\u003cbr\u003e\u003cspan\u003eThis article discusses the design of a voltage regulator suitable for high-voltage tube amplifier applications. It covers the challenges of producing stable output voltages with low output impedance, including detailed circuit diagrams and test results for a regulator based on the \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=LM317%20integrated%20circuit\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eLM317 integrated circuit\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eA WIDE-RANGE OHMMETER\u003cbr\u003eBy\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=John%20T.%20Bailey\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eJohn T. Bailey\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 36\u003cbr\u003e\u003cspan\u003eThis article presents a design for a versatile ohmmeter capable of measuring a wide range of resistances with good accuracy and ease of use. It includes circuit schematics, calibration tips, and explanations of how the meter works, making it a useful tool for electronics hobbyists and professionals.\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDEPARTMENTS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[\u0026amp;\u0026gt;li]:custom-bullet pl-[18px] rtl:pr-[18px]\"\u003e\n\u003cli\u003eEDITORIAL\u003cbr\u003eDogma, Digital \u0026amp; Debate — Page 6\u003c\/li\u003e\n\u003cli\u003eAUDIO AIDS\u003cbr\u003eBy\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=Art%20Newcomb\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eArt Newcomb\u003c\/span\u003e\u003c\/a\u003e,\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=Daniel%20J.%20McGuire\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eDaniel J. McGuire\u003c\/span\u003e\u003c\/a\u003e, and\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=Bob%20Ballard\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eBob Ballard\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 41\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCLASSIC CIRCUITRY\u003c\/strong\u003e\u003cbr\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003ca class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003eARC D-150 Amplifier\u003c\/a\u003e\u003c\/span\u003e\u003cbr\u003eCourtesy of\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=Jerry%20Saunders\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eJerry Saunders\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 44\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTROUBLESHOOTING\u003c\/strong\u003e\u003cbr\u003ePhono Servicing by\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=Kirk%20Vistain\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eKirk Vistain\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 46\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSHOWCASE\u003c\/strong\u003e\u003cbr\u003ePersonalizing Pass Power\u003cbr\u003eBy\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"https:\/\/www.google.com\/search?q=John%20Adelsbach\" class=\"inline align-baseline leading-5 text-color-text-01 transition-colors duration-200 ease-out hover:text-color-text-a cursor-default bg-[repeating-linear-gradient(to_right,theme(colors.color-text-03)_0,theme(colors.color-text-03)_1px,transparent_1px,transparent_2px)] hover:bg-[repeating-linear-gradient(to_right,theme(colors.color-text-a)_0,theme(colors.color-text-a)_1px,transparent_1px,transparent_2px)] bg-[length:100%_1px] bg-[position:0_calc(100%+0px)] bg-no-repeat pb-[2px] cursor-pointer\"\u003e\u003cspan\u003eJohn Adelsbach\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003e— Page 49\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Page 2\u003cbr\u003e\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Page 50\u003cbr\u003e\u003cstrong\u003eLETTERS\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Page 50\u003cbr\u003e\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Page 59\u003cbr\u003e\u003cstrong\u003eAD INDEX\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Page 62\u003c\/p\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48283653210326,"sku":"AA-2-1984","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/AA-2-1984-cover.jpg?v=1779487772"},{"product_id":"audio-amateur-1-1979-pdf","title":"Audio Amateur 1\/1979 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1979 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv data-start-index=\"0\" class=\"paragraph normal ng-star-inserted\"\u003e\n\u003cspan class=\"ng-star-inserted\" data-start-index=\"0\"\u003e1979 issue 1 of \u003c\/span\u003e\u003ci class=\"ng-star-inserted\" data-start-index=\"27\"\u003eAudio Amateur\u003c\/i\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"40\"\u003e offers a wealth of technical projects and deep-dive analyses for the serious audiophile. Here are the highlights of this issue:\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli data-start-index=\"168\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"168\"\u003eShowcase: The \"Super B--e\" 901\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"198\"\u003e: Discover Gunter Roehricht’s massive \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"236\"\u003e180-pound direct\/reflecting loudspeaker system\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"282\"\u003e. Inspired by the theories of Prof. Bose, this custom build features high-end English Jordan Watts drivers and integrated 150W RMS amplifiers for a truly unique listening experience\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"463\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"464\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"464\"\u003eGuest Editorial: The Evolution of the Recording Studio\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"518\"\u003e: Veteran console builder Neil A. Muncy provides a sobering look at how the signal path in recording studios has changed. Learn why modern \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"657\"\u003esignal processing gimmicks\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"683\"\u003e might be mangling the audio you hear on your favorite records\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"745\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"746\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"746\"\u003eThe Mark I: A Low Distortion IC Preamplifier\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"790\"\u003e: Build a \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"800\"\u003estate-of-the-art preamplifier\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"829\"\u003e that rivals expensive discrete designs. This high-performance unit leverages the latest generation of integrated circuits to achieve incredible slew rates and ultra-low noise, all in a compact, home-construction-friendly package\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1058\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"1059\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"1059\"\u003eSubjective Evaluation of the Mark I\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1094\"\u003e: Does the measurement-perfect Mark I sound good? David Vorhis puts the unit through \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"1179\"\u003erigorous subjective listening tests\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1214\"\u003e, comparing it against the Hafler preamp to see how IC performance stacks up against the competition\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1314\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"1315\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"1315\"\u003eScientific Audio Criticism\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1341\"\u003e: Tired of vague, poetic equipment reviews? Dr. Lawrence Greenhill explores \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"1417\"\u003etechniques to improve the reliability and validity of listening tests\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1486\"\u003e, introducing psychological research methods to help reviewers move past personal bias\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1572\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"1573\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"1573\"\u003eThe Warbler\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1584\"\u003e: Stop struggling with room reflections when testing your speakers. This clever project is a \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"1677\"\u003elow-cost 1\/3 octave warble tone generator\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1718\"\u003e that allows you to accurately measure loudspeaker frequency response in your own home without needing an anechoic chamber\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1840\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"1841\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"1841\"\u003eThe NQPR Revisited\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1859\"\u003e: Dive into the physics of \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"1886\"\u003edrone speaker cones\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"1905\"\u003e (passive radiators). David Ross sheds light on how undriven speakers can be tuned as tunable vent-substitutes to significantly extend the bass response of your system\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2072\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"2073\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"2073\"\u003eAudio Aids\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2083\"\u003e: This issue is packed with reader-submitted tips, including a simple \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"2153\"\u003epower supply modification for the Dyna Mark III\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2200\"\u003e, instructions for \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"2219\"\u003eadding 78RPM capability\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2242\"\u003e to a Philips turntable, and a fix for annoying \"pops\" in Soundcraftsman equalizers\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2325\"\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start-index=\"2326\" class=\"paragraph list-item normal ng-star-inserted\"\u003e\n\u003cb class=\"ng-star-inserted\" data-start-index=\"2326\"\u003eIn-Depth Test Reports\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2347\"\u003e: Get an expert’s take on \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"2373\"\u003eHeath’s Continuing Education course in electronics\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2423\"\u003e, and learn the most effective methodologies for \u003c\/span\u003e\u003cb class=\"ng-star-inserted\" data-start-index=\"2472\"\u003eevaluating loudspeakers\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\" data-start-index=\"2495\"\u003e through listening tests and professional records\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cspan data-start-index=\"0\" class=\"ng-star-inserted\"\u003eThe table of contents for the \u003c\/span\u003e\u003cb data-start-index=\"30\" class=\"ng-star-inserted\"\u003e1\/1979 issue of \u003c\/b\u003e\u003cb class=\"italic ng-star-inserted\" data-start-index=\"46\"\u003eThe Audio Amateur\u003c\/b\u003e\u003cspan data-start-index=\"63\" class=\"ng-star-inserted\"\u003e is as follows:\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"78\"\u003e\n\u003cb data-start-index=\"78\" class=\"ng-star-inserted\"\u003eShowcase\u003c\/b\u003e\u003cspan data-start-index=\"86\" class=\"ng-star-inserted\"\u003e: Gunter Roehricht\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"104\" class=\"ng-star-inserted\"\u003e .................................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"222\" class=\"ng-star-inserted\"\u003e2\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"223\"\u003e\n\u003cb data-start-index=\"223\" class=\"ng-star-inserted\"\u003eGuest Editorial\u003c\/b\u003e\u003cspan data-start-index=\"238\" class=\"ng-star-inserted\"\u003e: by Neil A. Muncy\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"256\" class=\"ng-star-inserted\"\u003e ........................................................................................................ \u003c\/span\u003e\u003cb data-start-index=\"362\" class=\"ng-star-inserted\"\u003e4\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"363\"\u003e\n\u003cb data-start-index=\"363\" class=\"ng-star-inserted\"\u003eThe Mark I: A Low Distortion IC Preamplifier \/ Control Unit\u003c\/b\u003e\u003cspan data-start-index=\"422\" class=\"ng-star-inserted\"\u003e: by Michael Lampton and Donald Zukauckas\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"463\" class=\"ng-star-inserted\"\u003e ........................................................................................................ \u003c\/span\u003e\u003cb data-start-index=\"569\" class=\"ng-star-inserted\"\u003e5\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"570\"\u003e\n\u003cb data-start-index=\"570\" class=\"ng-star-inserted\"\u003eListening Tests on the Mark I\u003c\/b\u003e\u003cspan data-start-index=\"599\" class=\"ng-star-inserted\"\u003e: by David Vorhis\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"616\" class=\"ng-star-inserted\"\u003e ............................................................................. \u003c\/span\u003e\u003cb data-start-index=\"695\" class=\"ng-star-inserted\"\u003e5\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"696\"\u003e\n\u003cb data-start-index=\"696\" class=\"ng-star-inserted\"\u003eIssues of Reliability and Validity in Subjective Audio Equipment Criticism\u003c\/b\u003e\u003cspan data-start-index=\"770\" class=\"ng-star-inserted\"\u003e: by Lawrence L. Greenhill, M.D.\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"802\" class=\"ng-star-inserted\"\u003e ............................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"915\" class=\"ng-star-inserted\"\u003e17\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"917\"\u003e\n\u003cb data-start-index=\"917\" class=\"ng-star-inserted\"\u003eThe Warbler\u003c\/b\u003e\u003cspan data-start-index=\"928\" class=\"ng-star-inserted\"\u003e: by Dick Crawford\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"946\" class=\"ng-star-inserted\"\u003e ........................................................................................................ \u003c\/span\u003e\u003cb data-start-index=\"1052\" class=\"ng-star-inserted\"\u003e22\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1054\"\u003e\n\u003cb data-start-index=\"1054\" class=\"ng-star-inserted\"\u003eThe NQPR Revisited\u003c\/b\u003e\u003cspan data-start-index=\"1072\" class=\"ng-star-inserted\"\u003e: by David Ross\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"1087\" class=\"ng-star-inserted\"\u003e ............................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"1184\" class=\"ng-star-inserted\"\u003e28\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1186\"\u003e\n\u003cb data-start-index=\"1186\" class=\"ng-star-inserted\"\u003eAudio Aids\u003c\/b\u003e\u003cspan data-start-index=\"1196\" class=\"ng-star-inserted\"\u003e: by readers Squires, Hill, Caldwell, Thompson, Winn, Hardwick, Moritko, and White\u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"1278\" class=\"ng-star-inserted\"\u003e ............................................................................................................................................ \u003c\/span\u003e\u003cb data-start-index=\"1420\" class=\"ng-star-inserted\"\u003e34\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1422\"\u003e\n\u003cb data-start-index=\"1422\" class=\"ng-star-inserted\"\u003eTest Reports\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"1434\" class=\"ng-star-inserted\"\u003e ............................................................................................................................................ \u003c\/span\u003e\u003cb data-start-index=\"1576\" class=\"ng-star-inserted\"\u003e44\u003c\/b\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1578\"\u003e\n\u003ci data-start-index=\"1578\" class=\"ng-star-inserted\"\u003eHeath's Continuing Education: Electronic Circuits\u003c\/i\u003e\u003cspan data-start-index=\"1627\" class=\"ng-star-inserted\"\u003e by Ronald H. Miller\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1647\"\u003e\n\u003ci data-start-index=\"1647\" class=\"ng-star-inserted\"\u003eHow to Evaluate Speakers\u003c\/i\u003e\u003cspan data-start-index=\"1671\" class=\"ng-star-inserted\"\u003e by Frederick M. Gloeckler, Jr.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1702\"\u003e\n\u003cb data-start-index=\"1702\" class=\"ng-star-inserted\"\u003eCORRECTIONS\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"1713\" class=\"ng-star-inserted\"\u003e ............................................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"1842\" class=\"ng-star-inserted\"\u003e49, 50\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1848\"\u003e\n\u003cb data-start-index=\"1848\" class=\"ng-star-inserted\"\u003eLETTERS\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"1855\" class=\"ng-star-inserted\"\u003e ................................................................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"2004\" class=\"ng-star-inserted\"\u003e49\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"2006\"\u003e\n\u003cb data-start-index=\"2006\" class=\"ng-star-inserted\"\u003eCLASSIFIED\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"2016\" class=\"ng-star-inserted\"\u003e .............................................................................................................................................. \u003c\/span\u003e\u003cb data-start-index=\"2160\" class=\"ng-star-inserted\"\u003e59\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"2162\"\u003e\n\u003cb data-start-index=\"2162\" class=\"ng-star-inserted\"\u003eAD INDEX\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\u003cspan data-start-index=\"2170\" class=\"ng-star-inserted\"\u003e ................................................................................................................................................ \u003c\/span\u003e\u003cb data-start-index=\"2316\" class=\"ng-star-inserted\"\u003e62\u003c\/b\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48317037314262,"sku":"AA-1-1979","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/79_01_cover.jpg?v=1780437215"},{"product_id":"audio-amateur-2-1979-pdf","title":"Audio Amateur 2\/1979 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1979 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e1979 issue 2 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e is packed with essential projects, technical deep-dives, and expert advice for the serious audio enthusiast. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: The Moritko Quad System\u003c\/strong\u003e: Step into the listening room of Joseph Moritko, Jr., and explore his unique \u003cstrong\u003eSQ quadraphonic arrangement\u003c\/strong\u003e. Featuring Hermeyer electrostatics and custom 12\" CTS woofers integrated into a blanket chest, this system achieves stunning three-dimensional imagery and transparency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Advent MPR-1 Microphone Preamp\u003c\/strong\u003e: Capture professional-quality live recordings with this high-performance, two-channel outboard preamp. Originally a rare Advent commercial product, this article provides the \u003cstrong\u003ecomplete construction details\u003c\/strong\u003e and schematics to build this low-noise, transformer-input gem yourself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Preamplifier Construction Shootout\u003c\/strong\u003e: Thinking about building a preamp but don't know where to start? S.A. Rossmassler compares \u003cstrong\u003efour distinct construction projects\u003c\/strong\u003e, including the Williamson 20\/20 and the Leach Preamp. Get the inside scoop on construction difficulties, part sourcing, and performance measurements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Cut: Myths and Problems\u003c\/strong\u003e: Go behind the scenes at the world-renowned \u003cstrong\u003eTeldec pressing plant\u003c\/strong\u003e in West Germany. Adrian Hope examines the technical hurdles and economic realities of the direct-to-disc phenomenon, revealing what it really takes to produce those \"audiophile\" pressings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Marantz 8-B\u003c\/strong\u003e: Own a piece of audio history. This issue features the full schematic for the \u003cstrong\u003elegendary Marantz 8-B power amplifier\u003c\/strong\u003e, a masterpiece of vintage engineering and a must-have reference for any tube enthusiast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Suppression of Surface Noise\u003c\/strong\u003e: D.T.N. Williamson (creator of the famous Williamson amplifier) delivers a definitive lecture on \u003cstrong\u003esilencing the pops and clicks\u003c\/strong\u003e of gramophone records. Learn the physics of record surface noise and the sophisticated gating techniques used to eliminate it without ruining the music.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoldering: The Basics\u003c\/strong\u003e: Master the most fundamental skill in audio. This \"thorough, enlightening primer\" by Marc Colen covers everything from \u003cstrong\u003esolder joint metallurgy\u003c\/strong\u003e to choosing the right iron and flux, ensuring your next project is as reliable as it is high-performing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: Discover a treasure trove of reader-submitted hacks, including a DIY \u003cstrong\u003eAB Box for equipment comparison\u003c\/strong\u003e, power supply upgrades for the \u003cstrong\u003eAudio Research SP-3A-1\u003c\/strong\u003e, and essential calibration tips for the \u003cstrong\u003eKenwood KX-1030\u003c\/strong\u003e cassette deck.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn-Depth Test Reports\u003c\/strong\u003e: Get the expert verdict on essential bench tools. This issue features rigorous evaluations of the \u003cstrong\u003eHeath ID-5252 Audio Load\u003c\/strong\u003e—a versatile dummy load for testing power amps—and the \u003cstrong\u003eHeath IG-1275 Sweep Generator\u003c\/strong\u003e, a high-precision instrument for frequency response analysis.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cspan data-start-index=\"0\" class=\"ng-star-inserted\"\u003eThe table of contents for the \u003c\/span\u003e\u003cb data-start-index=\"30\" class=\"ng-star-inserted\"\u003e1979\u003c\/b\u003e\u003cspan data-start-index=\"40\" class=\"ng-star-inserted\"\u003e issue 2 of \u003c\/span\u003e\u003ci data-start-index=\"50\" class=\"ng-star-inserted\"\u003eThe Audio Amateur\u003c\/i\u003e\u003cspan data-start-index=\"67\" class=\"ng-star-inserted\"\u003e:\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"104\"\u003e\n\u003cb data-start-index=\"104\" class=\"ng-star-inserted\"\u003eShowcase\u003c\/b\u003e\u003cspan data-start-index=\"112\" class=\"ng-star-inserted\"\u003e: Joseph Moritko, Jr. ......................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"240\" class=\"ng-star-inserted\"\u003e2\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"241\"\u003e\n\u003cb data-start-index=\"241\" class=\"ng-star-inserted\"\u003eEditorial\u003c\/b\u003e\u003cspan data-start-index=\"250\" class=\"ng-star-inserted\"\u003e ................................................................................................................................................. \u003c\/span\u003e\u003cb data-start-index=\"397\" class=\"ng-star-inserted\"\u003e4\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"398\"\u003e\n\u003cb data-start-index=\"398\" class=\"ng-star-inserted\"\u003eThe Advent MPR-1 Microphone Preamplifier\u003c\/b\u003e\u003cspan data-start-index=\"438\" class=\"ng-star-inserted\"\u003e: by Frederick M. Gloeckler, Jr. ........................... \u003c\/span\u003e\u003cb data-start-index=\"499\" class=\"ng-star-inserted\"\u003e5\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"500\"\u003e\n\u003cb data-start-index=\"500\" class=\"ng-star-inserted\"\u003eA Comparison of Preamplifier Construction Projects\u003c\/b\u003e\u003cspan data-start-index=\"550\" class=\"ng-star-inserted\"\u003e: by S. A. Rossmassler ........................... \u003c\/span\u003e\u003cb data-start-index=\"601\" class=\"ng-star-inserted\"\u003e11\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"603\"\u003e\n\u003cb data-start-index=\"603\" class=\"ng-star-inserted\"\u003eDirect Cut Myths and Problems\u003c\/b\u003e\u003cspan data-start-index=\"632\" class=\"ng-star-inserted\"\u003e: by Adrian Hope .......................................................................... \u003c\/span\u003e\u003cb data-start-index=\"724\" class=\"ng-star-inserted\"\u003e16\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"726\"\u003e\n\u003cb data-start-index=\"726\" class=\"ng-star-inserted\"\u003eClassic Circuitry: The Marantz 8-B Power Amplifier\u003c\/b\u003e\u003cspan data-start-index=\"776\" class=\"ng-star-inserted\"\u003e: Courtesy of E. B. Viotty ........................ \u003c\/span\u003e\u003cb data-start-index=\"828\" class=\"ng-star-inserted\"\u003e20\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"830\"\u003e\n\u003cb data-start-index=\"830\" class=\"ng-star-inserted\"\u003eThe Suppression of Surface Noise\u003c\/b\u003e\u003cspan data-start-index=\"862\" class=\"ng-star-inserted\"\u003e: by D.T.N. Williamson ............................................................ \u003c\/span\u003e\u003cb data-start-index=\"946\" class=\"ng-star-inserted\"\u003e22\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"948\"\u003e\n\u003cb data-start-index=\"948\" class=\"ng-star-inserted\"\u003eSoldering: The Basics\u003c\/b\u003e\u003cspan data-start-index=\"969\" class=\"ng-star-inserted\"\u003e: by Marc Colen ............................................................................................. \u003c\/span\u003e\u003cb data-start-index=\"1079\" class=\"ng-star-inserted\"\u003e24\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1081\"\u003e\n\u003cb data-start-index=\"1081\" class=\"ng-star-inserted\"\u003eAudio Aids\u003c\/b\u003e\u003cspan data-start-index=\"1091\" class=\"ng-star-inserted\"\u003e: by readers Davidson, LeBeck, Sellman, McIntyre, and Philpot ............................... \u003c\/span\u003e\u003cb data-start-index=\"1185\" class=\"ng-star-inserted\"\u003e30\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1187\"\u003e\n\u003cb data-start-index=\"1187\" class=\"ng-star-inserted\"\u003eTest Reports\u003c\/b\u003e\u003cspan data-start-index=\"1199\" class=\"ng-star-inserted\"\u003e ......................................................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"1338\" class=\"ng-star-inserted\"\u003e40\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1340\"\u003e\n\u003ci data-start-index=\"1340\" class=\"ng-star-inserted\"\u003eHeath's ID 5252 Audio Load\u003c\/i\u003e\u003cspan data-start-index=\"1366\" class=\"ng-star-inserted\"\u003e by Frederick M. Gloeckler, Jr.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1397\"\u003e\n\u003ci data-start-index=\"1397\" class=\"ng-star-inserted\"\u003eHeath's IG 1275 Sweep Generator\u003c\/i\u003e\u003cspan data-start-index=\"1428\" class=\"ng-star-inserted\"\u003e by Walt Jung\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1441\"\u003e\n\u003cb data-start-index=\"1441\" class=\"ng-star-inserted\"\u003eCORRECTIONS\u003c\/b\u003e\u003cspan data-start-index=\"1452\" class=\"ng-star-inserted\"\u003e ..................................................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"1587\" class=\"ng-star-inserted\"\u003e48\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1589\"\u003e\n\u003cb data-start-index=\"1589\" class=\"ng-star-inserted\"\u003eLETTERS\u003c\/b\u003e\u003cspan data-start-index=\"1596\" class=\"ng-star-inserted\"\u003e ............................................................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"1741\" class=\"ng-star-inserted\"\u003e48\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1743\"\u003e\n\u003cb data-start-index=\"1743\" class=\"ng-star-inserted\"\u003eCLASSIFIED\u003c\/b\u003e\u003cspan data-start-index=\"1753\" class=\"ng-star-inserted\"\u003e ........................................................................................................................................... \u003c\/span\u003e\u003cb data-start-index=\"1894\" class=\"ng-star-inserted\"\u003e57\u003c\/b\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cbutton class=\"xap-inline-dialog citation-marker ng-star-inserted\" aria-haspopup=\"dialog\" aria-describedby=\"cdk-describedby-message-ng-1-22\" data-disabled=\"false\"\u003e\u003c\/button\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"paragraph list-item normal ng-star-inserted\" data-start-index=\"1896\"\u003e\n\u003cb data-start-index=\"1896\" class=\"ng-star-inserted\"\u003eAD INDEX\u003c\/b\u003e\u003cspan data-start-index=\"1904\" class=\"ng-star-inserted\"\u003e ............................................................................................................................................. \u003c\/span\u003e\u003cb data-start-index=\"2047\" class=\"ng-star-inserted\"\u003e62\u003c\/b\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48317098950870,"sku":"AA-2-1979","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/79_02_cover.jpg?v=1780437682"},{"product_id":"audio-amateur-3-1979-pdf","title":"Audio Amateur 3\/1979 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1979 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e1979 issue 3 of \u003cem\u003eAudio Amateur\u003c\/em\u003e is a must-have for the dedicated audiophile, featuring groundbreaking circuit updates and deep dives into the science of sound. Here is why you need this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: The Vacuum Turntable\u003c\/strong\u003e: Discover Robert L. Doughty’s innovative DIY turntable that uses a \u003cstrong\u003evacuum system to hold records \"rock solid\"\u003c\/strong\u003e against a glass platter. It’s a precision-engineered solution designed to eliminate warp, wow, and flutter for pristine playback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Vacuum Tube, Variable Frequency Crossover\u003c\/strong\u003e: Bi-amplification enthusiasts can build Brian Waldron's \u003cstrong\u003econtinuously variable, 18dB\/octave Butterworth crossover\u003c\/strong\u003e. Using classic 12AX7 tubes, this project offers a detailed, warm signal path with switch-selectable ranges from 20Hz to 20kHz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe \"Compex\" Noise Reduction System\u003c\/strong\u003e: Reg Williamson introduces a professional-grade compandor (compressor\/expander) for the home recordist. Leveraging the versatile Signetics 570 chip, this \u003cstrong\u003elow-cost noise reduction project\u003c\/strong\u003e is designed to significantly clean up tape hiss and expand your system's dynamic range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe PAT-5\/WJ-1A: A Definitive Update\u003c\/strong\u003e: Audio legends Walt Jung and Dave White return with a massive update to their famous Dynaco PAT-5 modification. Learn how \u003cstrong\u003eDC coupling and FET inputs\u003c\/strong\u003e can strip away \"masking effects\" to reveal a level of sonic clarity that rivals high-end \"state-of-the-art\" gear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHoles, Hardware and Hearing\u003c\/strong\u003e: Dive into the fascinating world of psychoacoustics with Rod Rees and Ron Shaffer. This article explores how our \u003cstrong\u003eperceptual mindset and auditory space perception\u003c\/strong\u003e are just as critical as our hardware in achieving a truly realistic \"spatial\" listening experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Grounded Ear\u003c\/strong\u003e: In his debut column, Peter Sutheim provides an expert's perspective on the latest industry trends and technical seminars. This issue covers everything from \u003cstrong\u003einnovative ribbon transducer designs\u003c\/strong\u003e to new methodologies in loudspeaker measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Dynaco PAS-2\u003c\/strong\u003e: Tube enthusiasts will appreciate this detailed look at a vintage legend. This section provides the \u003cstrong\u003ecomplete schematic and technical specifications\u003c\/strong\u003e for the venerable Dynaco PAS-2 preamplifier.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase\u003c\/strong\u003e: Robert L. Doughty ...................................................................................................... \u003cstrong\u003e2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorials\u003c\/strong\u003e ........................................................................................................................................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Vacuum Tube, Variable Frequency Crossover\u003c\/strong\u003e: by Brian Waldron .................................... \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise Reduction Systems and One for Amateurs\u003c\/strong\u003e: by Reg Williamson .............................. \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe PAT-5\/WJ-1A: A PAT-5 WJ-1 Update\u003c\/strong\u003e: by Walt Jung and Dave White .......................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHoles, Hardware and Hearing\u003c\/strong\u003e: by Rod Rees and Ron Shaffer ............................................. \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Banks, Branam and Boutin ................................................................ \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Reviews\u003c\/strong\u003e: by Ron Miller ........................................................................................................ \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecordings Review\u003c\/strong\u003e: by editors Gloeckler and Williamson ..................................................... \u003cstrong\u003e49\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Grounded Ear\u003c\/strong\u003e: by Peter Sutheim ........................................................................................ \u003cstrong\u003e54\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Dynaco PAS-2 preamp ........................................................................... \u003cstrong\u003e56\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e57\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ............................................................................................................................................. \u003cstrong\u003e57\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ........................................................................................................................................ \u003cstrong\u003e65\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e .......................................................................................................................................... \u003cstrong\u003e70\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48317120938198,"sku":"AA-3-1979","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/79_03_cover.jpg?v=1780437907"},{"product_id":"audio-amateur-4-1979-pdf","title":"Audio Amateur 4\/1979 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1979 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e1979 issue 4 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e marks the end of the magazine's first decade with a collection of high-performance projects and expert insights. Here are the highlights to entice your inner audiophile:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: Audio Craftsmanship\u003c\/strong\u003e: Explore the beautiful, professional-grade builds of Randy Vikan, featuring custom-integrated versions of the Leach power amp and the Dyna chassis with a low-TIM preamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Williamson 40\/40 Power Amplifier\u003c\/strong\u003e: A decade after the original 20\/20 design, Reg Williamson returns with a more robust, 40-watt-per-channel evolution. This updated classic is designed for modern components and offers a low-distortion signal path that remains easy for home builders to construct.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversations with Peter Baxandall\u003c\/strong\u003e: In the first part of an exclusive interview, sit down with the legendary designer behind the ubiquitous \"Baxandall\" tone controls. He discusses his early inspirations, his work on radar during the war, and the evolution of high-quality audio reproduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Saga of Golden Ear vs. Meter Reader\u003c\/strong\u003e: Dive into the complex world of psychoacoustics. This article examines why subjective listening tests are often fraught with human bias and how psychological research can help us understand what we \u003cem\u003ereally\u003c\/em\u003e hear versus what the meters say.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Precision LED Power Meter\u003c\/strong\u003e: Traditional needle meters are often too slow for the fast transients of modern music. Build this high-speed, 12-indicator LED peak-reading meter to get a true, instantaneous look at your amplifier's actual power output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue features a treasure trove of technical tips, including a DIY \u003cstrong\u003e3dB ladder network\u003c\/strong\u003e, instructions for \u003cstrong\u003eleveling an SME 3009 III headshell\u003c\/strong\u003e, and a guide to understanding and using \u003cstrong\u003eZener diodes\u003c\/strong\u003e in your power supplies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: The Integrex Dolby Noise Reducer\u003c\/strong\u003e: Is the Integrex unit the right tool for cleaning up your tape recordings? This in-depth report evaluates its construction and performance as a full-function Dolby-B processor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Report: The Jung-White PAT-5\/WJ-1A\u003c\/strong\u003e: Audio expert David Vorhis provides a rigorous evaluation of the definitive update to the Dynaco PAT-5 preamplifier, testing if its DC-coupled refinements live up to the \"state-of-the-art\" hype.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Grounded Ear\u003c\/strong\u003e: Peter Sutheim explores the sonic impact of dbx noise reduction on vinyl records and discusses the nuances of professional microphones and on-location recording.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Audio Research SP-6\u003c\/strong\u003e: Reference the engineering of a tube masterpiece. This issue includes the complete schematic for the legendary Audio Research SP-6 preamplifier for your study or restoration projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase\u003c\/strong\u003e: Randy Vikan ........................................................................................................ \u003cstrong\u003e2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorials\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Williamson 40\/40 Power Amplifier\u003c\/strong\u003e: by Reg Williamson ....................................... \u003cstrong\u003e5\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversations with Peter Baxandall; Part I\u003c\/strong\u003e ..................................................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Saga of Golden Ear and Meter Reader\u003c\/strong\u003e: by Rod Rees and Ron Shaffer ............. \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Power Meter\u003c\/strong\u003e: by Duncan W. MacArthur ....................................................................... \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Davis, Brush, Clark, and Carlstrom .......................................... \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: The Integrex Dolby® Noise Reducer\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ........... \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Report: The Jung-White PAT-5\/WJ-1A\u003c\/strong\u003e: by David Vorhis ..................................... \u003cstrong\u003e48\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Grounded Ear\u003c\/strong\u003e: by Peter Sutheim ................................................................................ \u003cstrong\u003e54\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Audio Research SP-6 preamp ..................................................... \u003cstrong\u003e54\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ......................................................................................................................... \u003cstrong\u003e55\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e55\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e65\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e70\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48317142204630,"sku":"AA-4-1979","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/79_04_cover.jpg?v=1780438099"},{"product_id":"audio-amateur-1-1978-pdf","title":"Audio Amateur 1\/1978 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1978 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe first issue of \u003cstrong\u003e1978\u003c\/strong\u003e for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e kicks off a year of high-performance engineering and refined craftsmanship. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: Pandora's Box\u003c\/strong\u003e: Peer into the workshop of Alan Watling as he demonstrates a beautiful, \u003cstrong\u003emodular \"Hi-Fi test bed.\"\u003c\/strong\u003e This project showcases meticulous workmanship and provides a flexible platform for evaluating four channels of control, including preamps, tone controls, and filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Jung-White PAT-5 Modification\u003c\/strong\u003e: Audio legends Walt Jung and Dave White present a \"herculean\" update to the popular \u003cstrong\u003eDynaco PAT-5\u003c\/strong\u003e. This extensive modification replaces the original circuitry with state-of-the-art RIAA cards and a regulated power supply to strip away sonic \"fog\" and achieve professional-level performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHospital Radio: Audio for the Ailing\u003c\/strong\u003e: Reg Williamson explores the technical and social rewards of \u003cstrong\u003evolunteer audio engineering\u003c\/strong\u003e. Learn about the unique challenges of building and maintaining a broadcasting network for hospitals, including line equalization and interface designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproving the Dyna Mark III Power Supply\u003c\/strong\u003e: Give your classic tube amp a modern edge. James Boak details a \u003cstrong\u003esolid-state regulation modification\u003c\/strong\u003e for the Dynaco Mark III, designed to improve bias stability and reduce hum for a cleaner, more reliable output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Interfaces: Phono Cartridges\u003c\/strong\u003e: B. J. Webb begins an essential series on the critical relationship between the \u003cstrong\u003ephono cartridge and the preamplifier\u003c\/strong\u003e. Discover how load resistance and capacitance affect frequency response and how to optimize your setup for musical neutrality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heath’s IG-1272 Oscillator\u003c\/strong\u003e: Is this low-distortion audio oscillator the right addition to your workbench? This in-depth report evaluates the assembly process and performance of \u003cstrong\u003eHeath’s latest test instrument\u003c\/strong\u003e, testing its limits for precision audio measurements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial: The Digital Age is Here\u003c\/strong\u003e: Editor Edward T. Dell, Jr. reports from the 1977 AES convention, reflecting on the arrival of \u003cstrong\u003edigital recording technology\u003c\/strong\u003e and how the pursuit of \"good stuff\" in audio mirrors the uncompromising quality of a local ice cream legend.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Marantz Model 5\u003c\/strong\u003e: Study the engineering of a vintage masterpiece. This issue includes the \u003cstrong\u003ecomplete schematic\u003c\/strong\u003e for the Marantz Model 5 power amplifier, a valuable reference for restorers and tube enthusiasts alike.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorials\u003c\/strong\u003e: The Digital Age and Ice Cream ......................................................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePandora's Box\u003c\/strong\u003e: by Alan Watling .......................................................................................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModifying the PAT-5\u003c\/strong\u003e: by Walt Jung and Dave White ........................................................ \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHospital Radio: Audio for the ailing\u003c\/strong\u003e: by Reg Williamson ................................................ \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproving the Dyna Mark III Power Supply\u003c\/strong\u003e: by James E. Boak ..................................... \u003cstrong\u003e32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Interfaces: Part I Phono cartridges\u003c\/strong\u003e: by B. J. Webb .................................... \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Sommerwerck, Borden, Thompson and Trumbull ................... \u003cstrong\u003e45\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report\u003c\/strong\u003e: Heath's IG-1272 Low Distortion Audio Oscillator by Walt Morrey ........... \u003cstrong\u003e50\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBooks\u003c\/strong\u003e: Reviews by Richard Kunc, David Vorhis, Walt Jung, and R. H. Miller ............. \u003cstrong\u003e54\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Marantz Model 5 ........................................................................... \u003cstrong\u003e62\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ................................................................................................................. \u003cstrong\u003e63, 71\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e49\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBROWSING\u003c\/strong\u003e .............................................................................................................................. \u003cstrong\u003e71\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e72\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADVERTISING INDEX\u003c\/strong\u003e ........................................................................................................... \u003cstrong\u003e78\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321378025686,"sku":"AA-1-1978","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/78_01_cover.jpg?v=1780519777"},{"product_id":"audio-amateur-2-1978-pdf","title":"Audio Amateur 2\/1978 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1978 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe 1978 issue 2 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e features a deep bench of high-end DIY projects and technical investigations. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Big Bass Box\u003c\/strong\u003e: Tired of thin, weak low end? David Ruether details his massive \u003cstrong\u003e\"monster\" bass unit\u003c\/strong\u003e—a two-foot-wide housing for the legendary 24\" Hartley driver. Learn how to build the enclosure and a custom electronic crossover to achieve a level of realism in the bottom octave that few systems can match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Quality TV Sound Extractor\u003c\/strong\u003e: Stop settling for the tinny, low-fidelity audio from your television set. David Carlstrom provides a clever \u003cstrong\u003e\"sound tap\" project\u003c\/strong\u003e using a specialized IC that allows you to extract high-quality broadcast audio to enjoy through your main stereo system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModifying the Formula 4 Tonearm\u003c\/strong\u003e: Take a high-performance unipivot arm and make it even better. Fred Gloeckler details \u003cstrong\u003eprecision mechanical modifications\u003c\/strong\u003e, including the use of balsa wood and silicone damping, to optimize the popular Mayware arm for superior transparency and tracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper Stereo: Wave of the Future?\u003c\/strong\u003e: Go beyond traditional stereo and quadraphonic sound. Thomas Parsons explores groundbreaking Bell Labs research into \u003cstrong\u003espatial audio and binaural recording\u003c\/strong\u003e, showing how listeners can achieve a \"moving concert hall\" effect without the need for earphones.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Storage Cabinet for Phonograph Discs\u003c\/strong\u003e: Protect your investment with a \u003cstrong\u003ecustom-built vinyl library\u003c\/strong\u003e. The Editor provides complete plans and cutting guides for a professional-grade cabinet capable of holding up to 400 recordings in a sturdy, attractive housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Performance Tests for IC Op Amps\u003c\/strong\u003e: Audio legend Walt Jung begins a definitive series on \u003cstrong\u003eop-amp distortion\u003c\/strong\u003e. Discover standard laboratory methods for characterizing Total Harmonic Distortion (THD) and Slewing Induced Distortion (SID) to ensure you are selecting the highest-performance components for your DIY builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterfaces: Arms, Cartridges, Turntables\u003c\/strong\u003e: Master the critical relationship between your playback components. B.J. Webb explores the physics of \u003cstrong\u003emechanical resonance and compatibility\u003c\/strong\u003e, providing essential wisdom for anyone looking to eliminate mud and mistracking from their front-end system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heath’s IM 5258\u003c\/strong\u003e: Get the expert verdict on Heath's latest \u003cstrong\u003eTotal Harmonic Distortion analyzer\u003c\/strong\u003e. This in-depth report evaluates the assembly and performance of this auto-nulling instrument, testing if it lives up to its professional-grade specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: A treasure trove of reader-submitted hacks, including instructions for \u003cstrong\u003emounting the Grace G-707 tonearm\u003c\/strong\u003e on an AR turntable, techniques for \u003cstrong\u003ereducing room noise\u003c\/strong\u003e, and a critical math correction for the Heath IG-18 generator.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: This issue features the full schematic for the \u003cstrong\u003eUlric J. Childs 1951 control preamplifier\u003c\/strong\u003e, offering a fascinating reference for tube enthusiasts and restorers of vintage high-end gear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorials\u003c\/strong\u003e ........................................................................................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Big Bass Box\u003c\/strong\u003e: by David Ruether ........................................................................................ \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Quality TV Sound Extractor\u003c\/strong\u003e: by David Carlstrom ................................................................ \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModifying the Formula 4 Tonearm\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ............................................... \u003cstrong\u003e15\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper Stereo: Wave of the Future?\u003c\/strong\u003e: by Thomas W. Parsons ................................................. \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Storage Cabinet for Phonograph Discs\u003c\/strong\u003e: by The Editor ...................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterfaces: Arms, Cartridges, Turntables\u003c\/strong\u003e: by B.J. Webb ........................................................ \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Performance Tests for IC Op Amps\u003c\/strong\u003e: by Walt Jung ...................................................... \u003cstrong\u003e32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Philpot, Carlstrom \u0026amp; Muller, Spalding, and Wiles .......................... \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Ulric J. Childs preamp ............................................................................ \u003cstrong\u003e49\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heath's IM 5258\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ........................................................ \u003cstrong\u003e50\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ......................................................................................................................................... \u003cstrong\u003e50\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e50\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e56\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ....................................................................................................................................... \u003cstrong\u003e62\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321497432278,"sku":"AA-2-1978","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/78_02_cover.jpg?v=1780522014"},{"product_id":"audio-amateur-3-1978-pdf","title":"Audio Amateur 3\/1978 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1978 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe 1978 issue 3 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e delivers a fascinating mix of legendary interviews, precision engineering, and groundbreaking psychoacoustic theory. Here are the highlights to entice your inner audiophile:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: We Visit Peter Walker and Quad\u003c\/strong\u003e: Take an exclusive trip to Huntington, England, for a deep-dive interview with the founder of Quad. Peter Walker discusses the future of \u003cstrong\u003eelectrostatic loudspeakers\u003c\/strong\u003e, the goals of \"documentary\" sound reproduction, and why he remains skeptical of four-channel audio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Little Big Horn\u003c\/strong\u003e: Build a small, highly efficient \u003cstrong\u003efolded horn loudspeaker\u003c\/strong\u003e designed for a 6\" driver. This project offers a compact solution for those seeking the transient response and high efficiency of a horn without the massive bulk typically required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Audio Activated Power Switch\u003c\/strong\u003e: Simplify your system with this clever device that \u003cstrong\u003eautomatically switches on your power amplifiers\u003c\/strong\u003e when it detects an audio signal and shuts them down after the music stops—an ideal solution for hidden or remote equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Facts of Life on Sound Source Localization\u003c\/strong\u003e: Explore the \"shadowy area\" of how our brains perceive the shape and depth of sound. Dennis Bayzer provides provocative observations on \u003cstrong\u003eperceived sound localization\u003c\/strong\u003e that challenge traditional stereo reproduction concepts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise Control in IC Op Amps for Audio\u003c\/strong\u003e: Master the science of silent circuits with Walt Jung. This technical guide explains how to design for the \u003cstrong\u003elowest possible noise\u003c\/strong\u003e using integrated circuits, covering everything from thermal noise to input-referred noise voltage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: The Hafler DH-101\u003c\/strong\u003e: Is David Hafler’s low-priced newcomer truly a \"state-of-the-art\" contender? Walt Jung and David Vorhis provide a rigorous \u003cstrong\u003ebench test and subjective evaluation\u003c\/strong\u003e of this high-performance preamplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Interfaces: Universal Pickup Arms\u003c\/strong\u003e: Optimize your vinyl playback. B.J. Webb continues his essential series, providing professional advice on correctly \u003cstrong\u003emounting and setting up universal pickup arms\u003c\/strong\u003e for maximum fidelity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue is packed with DIY brilliance, including reader-submitted techniques for measuring \u003cstrong\u003ecrossover coil values\u003c\/strong\u003e, tips for \u003cstrong\u003egluing electrostatic panels\u003c\/strong\u003e, and instructions for creating a \u003cstrong\u003estorage 'scope substitute\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Childs 50W Amplifier\u003c\/strong\u003e: Reference the engineering of a vintage legend. This issue features the complete schematic for the \u003cstrong\u003eUlric J. Childs 50W Class A power amplifier\u003c\/strong\u003e, courtesy of Jack Hannold.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWe Visit Peter Walker and Quad\u003c\/strong\u003e: by the Editor ................................................................ \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Little Big Horn\u003c\/strong\u003e: by C.R.B. Lister ................................................................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Audio Activated Power Switch\u003c\/strong\u003e: by Jan Didden ........................................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Facts of Life on Sound Source Localization\u003c\/strong\u003e: by Dennis Bayzer ........................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise Control in IC Op Amps for Audio\u003c\/strong\u003e: by Walt Jung ................................................... \u003cstrong\u003e27\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: The Hafler DH-101\u003c\/strong\u003e: by Walt Jung \u0026amp; David Vorhis ........................................ \u003cstrong\u003e33\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Interfaces: Part III\u003c\/strong\u003e: by B.J. Webb ................................................................... \u003cstrong\u003e42\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Tooley, Smith, Carlstrom and Muller ......................................... \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Childs 50W Amplifier ........................................................................ \u003cstrong\u003e47\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e48\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e .......................................................................................................................... \u003cstrong\u003e48\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e58\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADVERTISING INDEX\u003c\/strong\u003e ........................................................................................................... \u003cstrong\u003e62\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321500315862,"sku":"AA-3-1978","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/78_03_cover.jpg?v=1780522297"},{"product_id":"audio-amateur-4-1978-pdf","title":"Audio Amateur 4\/1978 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1978 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe 1978 issue 4 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e concludes the magazine's ninth year with a heavy-hitting lineup of Class A power, precision test gear, and professional recording techniques. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Pass A-40 Power Amplifier\u003c\/strong\u003e: Build a masterpiece of \"pure Class A power\" from the legendary \u003cstrong\u003eNelson Pass\u003c\/strong\u003e. This deceptively simple 40-watt design uses constant current sourcing and heavy heat sinking to achieve a level of sonic transparency that rivals the world’s most expensive amplifiers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Thermal Primer\u003c\/strong\u003e: Stop guessing about cooling. James Boak provides the essential \"how-to\" on \u003cstrong\u003ecalculating thermal resistance and heat sink requirements\u003c\/strong\u003e to ensure your high-power solid-state projects stay cool and reliable under pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Direct Reading Capacitance Meter\u003c\/strong\u003e: Every serious builder needs a way to verify components. This versatile project allows you to \u003cstrong\u003eaccurately measure a capacitor's value and condition\u003c\/strong\u003e, including internal leakage resistance, using a clever triangle-wave generator.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoincident Microphone Technique\u003c\/strong\u003e: Learn the secrets of \"cleaner imaging\" from professional recording engineer Brian Preston. Discover how \u003cstrong\u003ecrossing two cardioid microphones\u003c\/strong\u003e can capture a live performance with stunning depth and perspective without the phase issues of multi-miking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Interfaces: Stylii, Dirt, and Grooves\u003c\/strong\u003e: In his final article for the magazine, the late B.J. Webb delivers a definitive guide to \u003cstrong\u003edisc maintenance\u003c\/strong\u003e. From fighting static to evaluating cleaning machines, learn the best methods to keep your vinyl software pristine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Reports: Dynaco and Pink Noise\u003c\/strong\u003e: Get the expert verdict on the \u003cstrong\u003eDynaco SE-10 10-octave equalizer\u003c\/strong\u003e and the \u003cstrong\u003eWest Side Electronics Pink Noise Generator\u003c\/strong\u003e, a sophisticated tool for room and speaker analysis using digital pseudo-random noise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: A treasure trove of reader-submitted ingenuity, featuring an \u003cstrong\u003e\"Isolationist Stand\" for turntables\u003c\/strong\u003e, a precision VTVM improvement, and technical tips for optimizing \u003cstrong\u003etransmission line speaker pipes\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: Study the engineering of a vintage pioneer. 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Williams\u003c\/strong\u003e: Explore a high-performance, craftsman-built system featuring \u003cstrong\u003etri-amped transmission lines\u003c\/strong\u003e and custom-built Class A power based on Nelson Pass’s designs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Pass A-40 Power Amplifier\u003c\/strong\u003e: by Nelson Pass ................................................................ \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Thermal Primer\u003c\/strong\u003e: by James Boak ....................................................................................... \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Direct Reading Capacitance Meter\u003c\/strong\u003e: by Richard Schroeder .......................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoincident Microphone Technique\u003c\/strong\u003e: by Brian Preston ..................................................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Interfaces: stylii, dirt, grooves\u003c\/strong\u003e: by B. J. Webb ................................................ \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Reports\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e32\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eDynaco SE-10\u003c\/em\u003e by David Vorhis\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eWest Side Electronics Pink Noise Generator\u003c\/em\u003e by Frederick M. Gloeckler, Jr.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Squires, Merrick, Carlstrom \u0026amp; Muller, Henneberg and Saunders ............................................................................................................................................ \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: Fairchild's Electronic Turntable ............................................................. \u003cstrong\u003e42\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase\u003c\/strong\u003e: Russell D. Williams' craftsman's system ............................................................ \u003cstrong\u003e46\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e47\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e .............................................................................................................................. \u003cstrong\u003e56\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADVERTISER INDEX\u003c\/strong\u003e ............................................................................................................. \u003cstrong\u003e62\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321502380246,"sku":"AA-4-1978","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/78_04_cover.jpg?v=1780522497"},{"product_id":"audio-amateur-1-1977-pdf","title":"Audio Amateur 1\/1977 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1977 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe 1977 issue 1 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e kicks off the year with a deep dive into advanced distortion analysis and creative DIY enclosure designs. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion (SID) in Audio Amplifiers\u003c\/strong\u003e: Audio legend Walt Jung begins a major new series exploring the correlation between measured distortion and what we actually hear. This first installment focuses on the critical, often-overlooked role of slew rate limiting in IC op amps and how it impacts sonic quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Folded-and-Stapled Bass Horn\u003c\/strong\u003e: Neil Davis presents a unique, low-cost solution for high-quality bass. Using epoxy-stiffened art board, you can build a high-performance, non-resonant horn enclosure for as little as $45 that produces stunningly realistic low-end response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmbience, Blumlein, and the Super Quadpod\u003c\/strong\u003e: Reg Williamson revisits the groundbreaking \"Middle-Side\" recording techniques of Alan Blumlein. Build the \"Super Quadpod\" to extract natural ambience from your records, providing a natural-sounding stereo or quadraphonic listening experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExperiments with the Not-Quite-Passive Radiator\u003c\/strong\u003e: Discover a fascinating acoustic phenomenon discovered by H.L. Eisenson. Learn how a simple \"trap\" circuit can turn an unconnected driver into a highly effective passive radiator, allowing for deep bass response from surprisingly small enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecording Studios by Amateurs\u003c\/strong\u003e: Brent Gabrielsen profiles three home-grown recording studios that prove professional results don't require a professional budget. From custom-built consoles to innovative use of everyday materials, see how amateurs are building their own high-fidelity recording environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Reports\u003c\/strong\u003e: Get the expert verdict on the \u003cstrong\u003eHeathkit Electronics Fundamentals Course\u003c\/strong\u003e, a comprehensive learning tool for any aspiring audio engineer, and the \u003cstrong\u003eProto Board Model 102\u003c\/strong\u003e, a must-have tool for rapid circuit prototyping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNostalgia: How to Buy a Gramophone\u003c\/strong\u003e: Celebrate the 100th anniversary of the phonograph with a guide to vintage audio. B. Clements-Henry provides essential tips on selecting and maintaining a classic \"talking machine\" that still delivers refined tone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Marantz Model 9\u003c\/strong\u003e: Study the engineering of a tube masterpiece. This issue features the complete, detailed schematic for the legendary Marantz Model 9 Power Amplifier for your reference or restoration projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase\u003c\/strong\u003e: Peer into the listening room of Kermit E. Johnson and explore his professional-grade system, which is largely derived from the high-performance projects featured in \u003cem\u003eThe Audio Amateur\u003c\/em\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTape Recorder Set-up\u003c\/strong\u003e: Howard A. Roberson offers essential supplemental tips on optimizing your tape deck. Learn the nuances of head alignment and tracking to ensure your recordings achieve maximum clarity and fidelity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion in Audio Amplifiers: Part 1\u003c\/strong\u003e: by Walt Jung ....................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe folded-and-stapled bass horn\u003c\/strong\u003e: by Neil Davis ........................................................... \u003cstrong\u003e10\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmbience, Blumlein, and the Super Quadpod\u003c\/strong\u003e: by Reg Williamson ............................ \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExperiments with the not-quite-passive radiator\u003c\/strong\u003e: by H.L. Eisenson .......................... \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecording Studios by amateurs\u003c\/strong\u003e: by Brent Gabrielsen ................................................. \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Reports\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e26\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eHeathkit's Electronics Fundamentals Course\u003c\/em\u003e by R.H. Miller\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eProto Board Model 102\u003c\/em\u003e by James Thoroman\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Bley, Carlstrom, Bostic, Schaffer and Gilmore ....................... \u003cstrong\u003e34\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow to buy a gramophone\u003c\/strong\u003e: by B. Clements-Henry ........................................................ \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: Marantz Model 9 Power Amplifier ........................................................ \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase\u003c\/strong\u003e: Kermit E. Johnson's mostly TAA derived system ........................................... \u003cstrong\u003e46\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Thoughts on Tape Recorder set-up\u003c\/strong\u003e: by Howard A. Roberson ............................. \u003cstrong\u003e53\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e47\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e58\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e ..................................................................................................................... \u003cstrong\u003e57\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ..................................................................................................................... \u003cstrong\u003e47\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321510310102,"sku":"AA-1-1977","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/77_01_cover.jpg?v=1780522698"},{"product_id":"audio-amateur-2-1977-pdf","title":"Audio Amateur 2\/1977 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1977 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe second issue of \u003cstrong\u003e1977\u003c\/strong\u003e for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e continues to push the boundaries of high-fidelity DIY with advanced driver designs and definitive distortion studies. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA High Efficiency Electrostatic Loudspeaker System: Part 1\u003c\/strong\u003e: Build a world-class speaker array from scratch. David Hermeyer shares his precision-engineered design for a high-efficiency system capable of producing \u003cstrong\u003e110dB peaks and a wide 40-degree dispersion\u003c\/strong\u003e, offering transparency that rivals the best commercial units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransient Response: A Do-It-Yourself Clinic\u003c\/strong\u003e: Is your system muffling the \"fleeting transients\" of your favorite music? Learn how to use a simple test record and an oscilloscope to identify and \u003cstrong\u003eeliminate bottlenecks in your signal chain\u003c\/strong\u003e, from the cartridge to the amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Amateur's Version of the Heil Air Motion Transformer\u003c\/strong\u003e: Step into the future of driver technology. Neil Davis provides a complete guide to building a DIY version of the revolutionary Heil driver, offering \u003cstrong\u003eextraordinary clarity and low distortion\u003c\/strong\u003e for high-frequency reproduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion: Part 2a \u0026amp; 2b\u003c\/strong\u003e: Walt Jung continues his landmark series on SID. This technical powerhouse explores \u003cstrong\u003eTotal Harmonic Distortion and two-tone intermodulation tests\u003c\/strong\u003e, providing the data you need to select the highest-performance IC op amps for your next project.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: The Dynaco Stereo 400\u003c\/strong\u003e: Get the expert verdict on one of the era’s most powerful kits. Walt Jung provides a detailed 12-hour construction log and \u003cstrong\u003erigorous bench tests\u003c\/strong\u003e to see if this 200W-per-channel heavyweight lives up to the \"super amp\" hype.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper Power Amplifiers: An Aural Comparison\u003c\/strong\u003e: Which \"super amp\" reigns supreme? This issue features a subjective listening comparison between the \u003cstrong\u003eGAS Ampzilla, Heath AA-1640, and the Dynaco Double 400\u003c\/strong\u003e, helping you decide which high-power solution belongs in your system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue is packed with clever reader-submitted hacks, including a \u003cstrong\u003e\"Super Crossover\" design\u003c\/strong\u003e and an ingenious \"Penurious Panning\" circuit for custom four-channel mixing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: Stay informed with expert reviews of the latest technical literature. R.H. Miller evaluates \u003cstrong\u003eessential circuit compendia\u003c\/strong\u003e containing thousands of tested designs to fuel your DIY curiosity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial: Zen and the Art of Audio Maintenance\u003c\/strong\u003e: The Editor reflects on the \"objective\/subjective dilemma\" and explores how our relationship with machines defines the quality of our listening experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial\u003c\/strong\u003e ............................................................................................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA High Efficiency Electrostatic Loudspeaker System: Part 1\u003c\/strong\u003e: by David P. Hermeyer ........... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransient Response: A Do-It-Yourself Clinic\u003c\/strong\u003e: by H. L. Eisenson .............................................. \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Amateur's Version of the Heil Air Motion Transformer\u003c\/strong\u003e: by Neil Davis ............................. \u003cstrong\u003e15\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion: Part 2a\u003c\/strong\u003e: by Walt Jung ................................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion: Part 2b\u003c\/strong\u003e: by Walt Jung ................................................................... \u003cstrong\u003e37\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Lovett and Bostic ....................................................................................... \u003cstrong\u003e42\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: The Dynaco Stereo 400\u003c\/strong\u003e: by Walt Jung .................................................................... \u003cstrong\u003e48\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper Power Amplifiers: An Aural Comparison\u003c\/strong\u003e: by Walt Jung ................................................ \u003cstrong\u003e62\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: by R. H. Miller ................................................................................................................ \u003cstrong\u003e64\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e .......................................................................................................................................... \u003cstrong\u003e69\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e .............................................................................................................................. \u003cstrong\u003e57\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e74\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADVERTISING INDEX\u003c\/strong\u003e ................................................................................................................... \u003cstrong\u003e73\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321511915734,"sku":"AA-2-1977","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/77_02_cover.jpg?v=1780522912"},{"product_id":"audio-amateur-3-1977-pdf","title":"Audio Amateur 3\/1977 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1977 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe 1977 issue 3 of \u003cem\u003eThe Audio Amateur \u003c\/em\u003eoffers a deep dive into advanced amplification, antenna design, and the latest technical research from the professional audio world. Here are the highlights to entice your inner audio enthusiast:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Speaker Saver\u003c\/strong\u003e: Say goodbye to the annoying \"thump\" of solid-state systems. Walt Jung presents a thumpless solid-state circuit that provides total transient protection for your output devices, speakers, and ears.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA High Efficiency Electrostatic Loudspeaker System: Part II\u003c\/strong\u003e: Continue your journey into high-end transparency. David Hermeyer unveils a new, smaller, and more efficient direct-drive IC\/tube amplifier specifically designed to power electrostatic speakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA $10 Three-Element Yagi Antenna for FM\u003c\/strong\u003e: Stop struggling with poor signal reception. Learn how to build a high-performance directional FM antenna for under $10 that provides a \"better answer\" for clean, quiet classical music reception.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Amateur at an AES Convention\u003c\/strong\u003e: Get an insider’s tour of the 55th Audio Engineering Society convention. Explore the latest prototypes in tape deck technology and sit in on technical sessions covering everything from psychoacoustics to microprocessor-controlled audio gear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion: Part 3\u003c\/strong\u003e: Dive into the cutting edge of distortion research. This installment focuses on Phase III testing—Transient Intermodulation (TIM) tests—using sine-square waves to characterize the performance of modern IC op amps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Gately Micromixer: Part I\u003c\/strong\u003e: Begin construction on a professional-grade, modular 16-in, 2-out mixing console. This part provides full-size guides and schematics for building the input module, complete with EQ and echo controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: Discover ingenious reader-submitted hacks, including a simple \u003cstrong\u003emetering circuit for the Dyna Mark III\u003c\/strong\u003e, a study on \u003cstrong\u003epower supply filtering\u003c\/strong\u003e, and a comprehensive guide to \u003cstrong\u003ecalculating stylus overhang\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: Expand your technical library with expert reviews of Lou Burroughs' \u003cem\u003eMicrophones: Design and Application\u003c\/em\u003e and Arthur Benade's \u003cem\u003eFundamentals of Musical Acoustics\u003c\/em\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: Reference the engineering of a legend. This issue features the basic schematics for \u003cstrong\u003eJohn Curl's JC-2 preamplifier\u003c\/strong\u003e, including the phono amp and output amplifier modules.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Speaker Saver: thumpless solid state audio\u003c\/strong\u003e: by Walt Jung .................................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA High efficiency electrostatic loudspeaker system: Part II\u003c\/strong\u003e: by David P. Hermeyer ..................................................................................................................... \u003cstrong\u003e8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA $10 Three-Element Yagi Antenna for FM\u003c\/strong\u003e: by John A. Stein ..................................... \u003cstrong\u003e15\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Amateur at an AES Convention\u003c\/strong\u003e: by James O. Thoroman .......................................... \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion: Part 3\u003c\/strong\u003e: by Walt Jung, Mark L. Stephens and Craig Todd ........................................................................................................................................... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Gately Micromixer: Part I\u003c\/strong\u003e: by Ed Gately ...................................................................... \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Boylan, Klett and Hosain ............................................................ \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: by Richard Honeycutt and Thomas W. Parsons ............................................. \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: John Curl's JC-2 1973-1976 ................................................................. \u003cstrong\u003e48\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ........................................................................................................................... \u003cstrong\u003e49\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e49\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e59\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e62\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321520468182,"sku":"AA-3-1977","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/77_03_cover.jpg?v=1780523159"},{"product_id":"audio-amateur-4-1977-pdf","title":"Audio Amateur 4\/1977 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1977 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe 1977 issue 4 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e concludes the year with a powerful mix of vintage restoration, precision testing, and groundbreaking research into what makes audio truly sound \"good.\" Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Research Remakes the Dynaco Stereo 70\u003c\/strong\u003e: Witness the transformation of a classic. William Z. Johnson of Audio Research takes the venerable Dyna ST-70 and reimagines it with a sophisticated, highly regulated circuit design. This article provides the complete technical details to turn a budget legend into a \"state-of-the-art\" contender,,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing Induced Distortion (SID): The Listening Tests\u003c\/strong\u003e: In the definitive conclusion to his landmark series, Walt Jung puts his measurements to the \"acid test.\" Through rigorous subjective listening evaluations, learn exactly how different levels of SID manifest as audible grit or a loss of \"sweetness\" in your music,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e111dB’s Around the Workshop\u003c\/strong\u003e: Precision is key to a great build. Frederick Gloeckler details how to construct a Constant Resistance Decade Attenuator (CRDA). This professional-grade tool allows you to measure gain and frequency response with a resolution of 0.1dB, far surpassing standard amateur gear,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Super Buff: Mating Hostile Impedances\u003c\/strong\u003e: Stop your tape recorder from \"sucking the life\" out of your preamp. Walter Morrey introduces a high-performance buffer circuit designed to isolate your signal path from the loading effects of recording equipment, preserving high-frequency clarity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Gately Micromixer: Part 2\u003c\/strong\u003e: Continue your journey into professional-grade recording. This second installment provides the full-size guides and wiring diagrams for the stereo output module of the 16-in, 2-out modular mixing console,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial: The Decline and Fall of FM\u003c\/strong\u003e: A veteran engineer provides a sobering look at how commercial interests and signal processing \"gimmicks\" have degraded the once-pristine medium of FM broadcasting. Learn why the \"good stuff\" is getting harder to find on the airwaves,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heath’s IM 5248 IM Analyzer\u003c\/strong\u003e: Get the expert verdict on Heath's latest intermodulation distortion analyzer. This report evaluates whether this $170 kit can provide the laboratory-grade accuracy needed for serious equipment design and troubleshooting,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue is packed with clever reader hacks, including a DIY \u003cstrong\u003etape deck switching circuit\u003c\/strong\u003e, instructions for \u003cstrong\u003eadding 78 RPM capability\u003c\/strong\u003e to Technics turntables, and tips for \u003cstrong\u003eimproving capacitor fidelity\u003c\/strong\u003e,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Audio Research D-76A\u003c\/strong\u003e: Study the engineering of a modern masterpiece. This issue features the full, detailed schematic for the legendary D-76A amplifier, offering a fascinating look at professional-grade tube design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial\u003c\/strong\u003e: The Decline and Fall of FM by Roy H. Trumbull ..................................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Research Remakes Dynaco's Stereo 70\u003c\/strong\u003e: by Edward T. Dell, Jr. ............................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e111dB’s Around the workshop\u003c\/strong\u003e: by Frederick M. Gloeckler, Jr. .......................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Super Buff: mating hostile impedances\u003c\/strong\u003e: by Walter Morrey ..................................... \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlewing induced distortion in audio amplifiers Part IV: listening tests at last\u003c\/strong\u003e: by Walter G. Jung ........................................................................................................................ \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Gately Micromixer: Part 2\u003c\/strong\u003e: by Edward J. Gately ......................................................... \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heath's IM 5248 Intermodulation Distortion Analyzer\u003c\/strong\u003e: by Frederick M. Gloeckler, Jr. .......................................................................................................... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Carlstrom, Shults, Sellman, Marsh and Merrick .......................... \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e51\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e57\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e .......................................................................................................................... \u003cstrong\u003e51\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e62\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48321527087318,"sku":"AA-4-1977","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/77_04_cover.jpg?v=1780523304"},{"product_id":"audio-amateur-1-1976-pdf","title":"Audio Amateur 1\/1976 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1976 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1976 issue 1 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e launches the year with a focused look at precision signal management, innovative record maintenance, and high-performance tube amplification. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Mixers: Part I\u003c\/strong\u003e: Begin your journey into professional-grade audio production. Edward J. Gately, Jr. kicks off a definitive series on \u003cstrong\u003emixer design and signal management\u003c\/strong\u003e, covering everything from input pads and panning to the complexities of cue\/foldback systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Vacuum System for Cleaning Recordings\u003c\/strong\u003e: Give your vinyl a new lease on life. Robert C. Borden details how to build a \u003cstrong\u003eDIY record-cleaning machine\u003c\/strong\u003e using a vacuum nozzle and a clever \"reading pacer\" lead screw to pull deep-seated dirt out of the grooves for pristine, silent playback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Sanders Electrostatic Amplifier\u003c\/strong\u003e: Power your electrostatic speakers with the transparency they deserve. Roger R. Sanders presents a \u003cstrong\u003ehigh-voltage, direct-coupled tube amplifier\u003c\/strong\u003e designed to eliminate the \"masking effects\" of transformers and achieve stunning midrange detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Seismic Platform\u003c\/strong\u003e: Stop acoustic feedback before it starts. This project details the construction of a \u003cstrong\u003emechanical isolation platform\u003c\/strong\u003e using specialized Barry mounts to protect your turntable from room vibrations and footfalls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Ace ZD Preamp\u003c\/strong\u003e: Is \"zero distortion\" possible in a budget kit? This in-depth evaluation examines the \u003cstrong\u003eAce Audio Basic Preamp\u003c\/strong\u003e, testing its minimalist \"straight-wire-with-gain\" philosophy and subjective sonic performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Report: Toyo Peak Level Meter\u003c\/strong\u003e: Upgrade your monitoring beyond sluggish analog needles. This report evaluates a \u003cstrong\u003ehigh-speed electronic peak meter\u003c\/strong\u003e that provides a more accurate look at the fast transients in your audio signal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre Four Channels Enough?\u003c\/strong\u003e: Explore the limits of spatial reproduction. Dennis Bayzer provides a \u003cstrong\u003ephilosophical and technical critique of quadraphonic sound\u003c\/strong\u003e, questioning if four speakers are truly enough to capture the realism of a live concert hall.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue features essential DIY hacks, including techniques for \u003cstrong\u003ecassette tape conservation\u003c\/strong\u003e, servicing the \u003cstrong\u003eSansui 3000A receiver\u003c\/strong\u003e, and an ingenious shim to \u003cstrong\u003esave tape recorder heads\u003c\/strong\u003e from premature wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: Audio Research D-76\u003c\/strong\u003e: Study a modern tube legend. This issue includes the \u003cstrong\u003ecomplete, detailed schematic\u003c\/strong\u003e for the Audio Research D-76 amplifier, a masterpiece of regulated tube engineering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Mixers: Part I\u003c\/strong\u003e: by Edward J. Gately, Jr. ................................................................ \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Vacuum System for Cleaning Recordings\u003c\/strong\u003e: by Robert C. Borden .............................. \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Sanders Electrostatic Amplifier\u003c\/strong\u003e: by Roger R. Sanders .......................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Seismic Platform\u003c\/strong\u003e: by H. L. Eisenson ............................................................................ \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Gibbons, Hardwick, Hermeyer, Harris, Lister, Gloeckler ............ \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Ace ZD Preamp\u003c\/strong\u003e: by James Thoroman .......................................................... \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Report: Toyo Peak Level Meter\u003c\/strong\u003e: by Douglas H. Preis ...................................... \u003cstrong\u003e31\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre Four Channels Enough?\u003c\/strong\u003e: by Dennis Bayzer ............................................................. \u003cstrong\u003e34\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: Audio Research D-76 Amplifier .......................................................... \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBookshelf: IC's Galore\u003c\/strong\u003e: by R. H. Miller ............................................................................ \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ..................................................................................................................... \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e43\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"suggestions-container ng-star-inserted\"\u003e\n\u003cdiv class=\"follow-up-vertical-container ng-star-inserted\"\u003e\n\u003cdiv role=\"button\" class=\"follow-up-chip mat-body-medium grey-background ng-star-inserted\" tabindex=\"0\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323869737174,"sku":"AA-1-1976","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/76_01_cover.jpg?v=1780599002"},{"product_id":"audio-amateur-2-1976-pdf","title":"Audio Amateur 2\/1976 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1976 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1976 issue 2 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e is a standout edition featuring radical DIY engineering and definitive technical reports. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Object All Sublime\u003c\/strong\u003e: Step back from the workbench and explore the philosophy of sound. Guest editor B. J. Webb examines the \"illusion of reality\" in audio, arguing that true high fidelity is found in the listener's mind and the music's soul, not just in the measurements,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Praying Mantis\u003c\/strong\u003e: Discover one of the most unique DIY projects ever featured. David Ruether details his \"outlandish\" experimental tonearm—built from balsa wood, sewing needles, and thread—designed to conquer record warps and achieve professional-grade transparency,,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeath's AA-1640 \"Super\" Power Amp\u003c\/strong\u003e: Is this the best kit value in audio? Walt Jung provides a massive, 7-page investigation into this 200W-per-channel heavyweight, testing its brute strength and its surprisingly refined \"projects forward\" musicality,,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Mixers: Part 2\u003c\/strong\u003e: Master your signal path. Professional designer Edward Gately continues his series on mixer architecture, providing the essential building blocks for low-noise preamps and versatile equalizers,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemodify Dyna’s PAS Preamp\u003c\/strong\u003e: Give your classic Dynaco a \"state-of-the-art\" upgrade. David Vorhis returns with a definitive new set of modifications that strip away the \"fog\" and coloration of the stock PAS, rivaling the performance of high-end boutique gear,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Miraculous State Variable Filter\u003c\/strong\u003e: Learn the secrets of the most versatile filter in audio. Walt Jung explains how to use op-amps to create \"state variable\" circuits that provide simultaneous high-pass, low-pass, and band-pass outputs for precision audio applications,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue features essential reader-submitted hacks, including a critical study on how \u003cstrong\u003eAC line voltage impacts your power amp's performance\u003c\/strong\u003e and a simple DIY fix for \u003cstrong\u003eannoying phono cartridge static\u003c\/strong\u003e,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: Marantz Model 5\u003c\/strong\u003e: Study a vintage masterpiece. This issue includes the full, detailed schematic for the legendary Marantz Model 5, a 30-watt tube icon and a landmark of 1950s engineering,.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Object All Sublime (A Guest Editorial)\u003c\/strong\u003e: by B. J. Webb ........................................ \u003cstrong\u003e2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Praying Mantis\u003c\/strong\u003e: by David Ruether .......................................................................... \u003cstrong\u003e5\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heath's AA-1640 Amplifier\u003c\/strong\u003e: by Walt Jung ............................................... \u003cstrong\u003e10\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Mixers: Part 2\u003c\/strong\u003e: by Edward J. Gately, Jr. ............................................................. \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemodify Dyna's PAS Preamp\u003c\/strong\u003e: by David A. Vorhis ................................................... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Preis, Ruether, Sanders, Lamkins and Carlstrom ................. \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOp Amps for Audio: Active Filters Part 3\u003c\/strong\u003e: by Walt Jung ............................................ \u003cstrong\u003e32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Marantz Model 5 Amplifier ........................................................ \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e39\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ......................................................................................................................... \u003cstrong\u003e43\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ........................................................................................................................... \u003cstrong\u003e46\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323885695190,"sku":"AA-2-1976","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/76_02_cover.jpg?v=1780599192"},{"product_id":"audio-amateur-3-1976-pdf","title":"Audio Amateur 3\/1976 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1976 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1976 issue 3 delivers precision testing tools, professional recording insights, and a deep dive into high-efficiency speaker design.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA White Noise Generator and Pink Filter\u003c\/strong\u003e: Build an essential tool for testing room and loudspeaker response. A. John Petzold shows you how to construct a reliable, low-cost random noise generator with a specialized pink filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA to Z Tape Recorder Set-up\u003c\/strong\u003e: Is your tape deck performing at its peak? Craig L. Stark begins a definitive series on optimizing your recorder, covering head cleaning, demagnetizing, and the critical tangency and azimuth alignments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModifying the Rabco SL8E\u003c\/strong\u003e: Transform a good tonearm into a near-perfect one. Raymond Kilmanas details a thorough modification using lightweight aluminum tubing and a unipivot design to eliminate friction and tracking errors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Mixers—Part 3\u003c\/strong\u003e: Go inside the \"Prokit\" for a close-up look at professional mixer architecture. This installment analyzes commercial signal paths to illustrate real-world applications for your DIY mixing projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign and Build a High-Efficiency Speaker System\u003c\/strong\u003e: Achieve stunning realism with a high-efficiency coaxial design. This deep dive covers the theory of sound pressure levels and provides step-by-step instructions for building enclosures for the Altec 604-8G.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Aries 300 Synthesizer\u003c\/strong\u003e: Wrestle a massive 90-hour synthesizer kit into being. This extensive report evaluates the design, construction, and sonic capabilities of the Aries 300 modular system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: Discover practical ingenuity from readers, featuring a DIY cable identifier, a clever method for cleaning cassette tapes, and instructions for making professional-looking photo front panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: Audio Research EC-3\u003c\/strong\u003e: Reference the engineering of a high-end electronic crossover with the detailed schematic for the Audio Research EC-3.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: Expand your technical library with a review of Don Lancaster's \u003cem\u003eActive Filter Cookbook\u003c\/em\u003e, an essential resource for anyone designing precision audio filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch4\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA White Noise Generator and Pink Filter\u003c\/strong\u003e: by A. John Petzold ................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA to Z Tape recorder set-up—1\u003c\/strong\u003e: by Craig L. Stark ........................................................ \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModifying the Rabco SL8E\u003c\/strong\u003e: by Raymond Kilmanas .................................................... \u003cstrong\u003e10\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Mixers--Part 3\u003c\/strong\u003e: by Edward J. Gately, Jr. ............................................................. \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign and build a high efficiency speaker system\u003c\/strong\u003e: by Robert and William Bowyer and Michael Lampton .......................................................................................................................... \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Aries 300 Synthesizer\u003c\/strong\u003e: by James Thoroman and Paul Taylor ............. \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers W. Miller, C. L. Stark, T. Lathrop, D. Carlstrom and J. Stein ............................................................................................................................................ \u003cstrong\u003e32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: Audio Research EC-3 Electronic crossover ................................... \u003cstrong\u003e35\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: Guest review by Walt Jung .......................................................................... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e39\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e .................................................................................................................. \u003cstrong\u003e39\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ......................................................................................................................... \u003cstrong\u003e43\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e ................................................................................................................. \u003cstrong\u003e42\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ........................................................................................................................... \u003cstrong\u003e46\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323895722198,"sku":"AA-3-1976","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/76_03_cover.jpg?v=1780599419"},{"product_id":"audio-amateur-4-1976-pdf","title":"Audio Amateur 4\/1976 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1976 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1976 issue 4 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e concludes the magazine's seventh year with a 64-page edition featuring sophisticated IC applications, classic tube modifications, and essential testing guides. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompandor Power with the 570\/571 IC\u003c\/strong\u003e: Unlock the potential of the new Signetics monolithic compandor chips. Audio legend Walt Jung and Craig Todd provide a deep dive into these versatile devices, offering ready-to-use circuits for \u003cstrong\u003eprofessional-grade noise reduction\u003c\/strong\u003e, voltage-controlled faders, and high-performance squelch systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModify Your Heath IM Distortion Analyzer\u003c\/strong\u003e: Don't retire your trusty tube-type IM-48 just yet. Frederick Gloeckler reveals how to slash residual distortion from 0.1% to near-professional levels through clever \u003cstrong\u003epower supply filtering and filter modifications\u003c\/strong\u003e, ensuring your vintage gear can test modern state-of-the-art equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModernizing the Dyna Stereo 70\u003c\/strong\u003e: Give the world's most popular tube amplifier a \"modest gilding.\" H.L. Eisenson details an \u003cstrong\u003eaffordable, effective modification\u003c\/strong\u003e focusing on power supply and bias stability to achieve accurate performance that rivals expensive boutique gear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaster the Art of Tape Set-up\u003c\/strong\u003e: Craig Stark continues his masterclass on making your recorder \"feel better and work better.\" Part 2 focuses on the critical electronic adjustments—including \u003cstrong\u003ebias, record equalization, and VU meter calibration\u003c\/strong\u003e—needed for peak fidelity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReach for the Rafters with a 20-Foot Mic Stand\u003c\/strong\u003e: Tired of poor mic placement at live recordings? Learn how to build a \u003cstrong\u003erugged, portable, 20-foot tall microphone stand\u003c\/strong\u003e for around $20 using stainless steel conduit. It’s the perfect solution for capturing the perfect ambiance in churches and concert halls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional Testing on a Budget\u003c\/strong\u003e: Is the Heath IO-4550 the high-performance tool your workbench is missing? Our in-depth kit report puts this \u003cstrong\u003e10MHz dual-trace, triggered-sweep oscilloscope\u003c\/strong\u003e to the test to see if it delivers the precision required for serious audio work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiscover the Best of Europe with the \u003cem\u003eEuro-Disc Gazette\u003c\/em\u003e\u003c\/strong\u003e: Bound into this issue is the premier of a new feature offering reprints of \u003cstrong\u003eelite record reviews from across the pond\u003c\/strong\u003e. Find the finest European recordings and learn how to have them shipped directly to your listening room.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: A treasure trove of reader-submitted ingenuity, from \u003cstrong\u003eDIY wire-wrapping tools\u003c\/strong\u003e for prototyping to essential performance hacks for AR turntables and Heath TV sets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation and Uses for the 570\/571 IC compandor chip\u003c\/strong\u003e: by Walt Jung and Craig Todd ... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModify your Heath tube-type IM distortion analyzer\u003c\/strong\u003e: by Frederick M. Gloeckler, Jr. ... \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDyna's Stereo 70: a simple modification\u003c\/strong\u003e: by H. L. Eisenson ... \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA-Z Tape recorder set-up--Part 2\u003c\/strong\u003e: by Craig L. Stark ... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA tall, portable microphone stand\u003c\/strong\u003e: by Alan S. Douglas ... \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Berglas, Gloeckler, Branam, and Carlstrom ... \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEuro-Disc Gazette\u003c\/strong\u003e ... \u003cstrong\u003e31\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heath's IO-4550 Oscilloscope\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ... \u003cstrong\u003e50\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e ... \u003cstrong\u003e50\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e ... \u003cstrong\u003e57\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ... \u003cstrong\u003e59\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ... \u003cstrong\u003e59\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323912204502,"sku":"AA-4-1976","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/76_04_cover.jpg?v=1780599686"},{"product_id":"audio-amateur-1-1975-pdf","title":"Audio Amateur 1\/1975 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1975 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1975 issue 1 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e is a technical treasure trove for the perfectionist, featuring elite speaker designs and advanced filter theory. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Proven Transmission Line Loudspeaker\u003c\/strong\u003e: Build a world-class four-speaker enclosure designed for the perfectionist. Using high-end KEF drivers and a specialized crossover, B. J. Webb details a transmission line system that achieves deep, extended, and non-resonant bass response that \"thrown away\" radiation designs simply can't match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeaker Evaluation: Ear or Machine?\u003c\/strong\u003e: Part 1 of this series dives into the complex psychology of listening. Learn how physical and mental factors—and even the behavior of other people—can bias your perception of sound, and discover how to set up more reliable A-B comparison tests.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Test Bench Filter Set\u003c\/strong\u003e: Speed up your equipment checkups with these four \"must-have\" gadgets. This project includes a bias trap for tape recorders, a 20kHz noise filter, an ASA weighting network, and an inverse RIAA equalization network to help your measurements correlate better with human hearing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOp Amps for Audio: Active Filters\u003c\/strong\u003e: Master the art of frequency management with audio legend Walt Jung. This introductory guide explains the theory and practice of using modern op amps to build high-performance active filters that are easier to tune and more reliable than traditional passive designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultipath Revisited\u003c\/strong\u003e: Solve your FM reception woes. This follow-up and rebuttal provides a deep dive into the causes of multipath distortion and shows you exactly how to use an oscilloscope to detect and fix these signal-degrading reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaith, Fidelity, and the Whatsis\u003c\/strong\u003e: Take a nostalgic tour of the audio \"hi-fi go-round\". Wailes Gray reflects on decades of audio trends—from early bass-reflex enclosures to the quadraphonic craze—finding that true musical satisfaction often lies in elegant simplicity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Audio Research SP-3A-1\u003c\/strong\u003e: Study the engineering of a modern masterpiece. This issue includes the complete schematic and parts list for the legendary SP-3A-1 preamplifier, a unit recognized even then as one of the few production pieces worthy of the \"classic\" label.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: Discover ingenious DIY fixes from fellow readers, including a \"Double Dub and Fader\" for managing two tape recorders, tips for repairing snapped cartridge tapes, and instructions for building better tonearm pivots.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Proven Transmission Line Loudspeaker\u003c\/strong\u003e: by B. J. Webb ................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeaker Evaluation: Ear or Machine? Part 1\u003c\/strong\u003e: by Roger H. Russell ................................... \u003cstrong\u003e10\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Test Bench Filter Set\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ........................................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOp Amps for Audio: Active Filters, Part I\u003c\/strong\u003e: by Walt Jung ................................................. \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Hayward, Bayzer, Royer, and Gibbons ........................................... \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: by Ronald H. Miller .......................................................................................... \u003cstrong\u003e31\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaith, Fidelity, and the Whatsis\u003c\/strong\u003e: by Wailes Gray ........................................................... \u003cstrong\u003e34\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultipath Revisited\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ................................................................ \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Audio Research SP-3A-1 ............................................................. \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAd Index\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking\u003c\/strong\u003e .......................................................................................................................... \u003cstrong\u003e45\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e46\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323922690262,"sku":"AA-1-1975","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/75_01_cover.jpg?v=1780600138"},{"product_id":"audio-amateur-2-1975-pdf","title":"Audio Amateur 2\/1975 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1975 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1975\u003c\/strong\u003e issue 2 edition of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e features high-performance circuit designs, definitive kit evaluations, and practical guides for the audiophile community. Here are the highlights to entice you to pick up this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Variable Frequency Equalizer\u003c\/strong\u003e: Move beyond basic tone controls with this professional-grade three-section peaking equalizer. Featuring \u003cstrong\u003e12dB of boost or cut and adjustable frequency ranges\u003c\/strong\u003e, this project is ideal for fine-tuning home systems or integrating into a modular mixer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow to Found an Audio Group\u003c\/strong\u003e: Learn how to build a thriving community of local audiophiles with first-hand advice from the leaders of the \u003cstrong\u003eBoston and New York Audio Societies\u003c\/strong\u003e. This article covers everything from initial organization and meeting logistics to finding the perfect \"home\" for your group.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: The Taming of Ampzilla\u003c\/strong\u003e: Get the definitive word on the legendary Great American Sound \"super power\" amplifier. Expert Walt Jung provides exhaustive bench tests and introduces \u003cstrong\u003ecritical modifications to the input stage and bias regulator\u003c\/strong\u003e to help you achieve true state-of-the-art fidelity from this 200W-per-channel beast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeaker Evaluation: Ear or Machine? (Part 2)\u003c\/strong\u003e: Roger H. Russell continues his investigation into the \"elegant techniques and machines\" used to measure loudspeaker performance. Discover how to account for room acoustics, interpret \u003cstrong\u003ereal-time analyzer data\u003c\/strong\u003e, and conduct more valid subjective listening tests.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue is packed with reader-submitted ingenuity, including a specialized \u003cstrong\u003eXLR cable checker\u003c\/strong\u003e and a professional technique for \u003cstrong\u003e\"oven-baking\" a durable, high-end finish\u003c\/strong\u003e onto your custom equipment panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOp Amps for Audio: Active Filters (Part 2)\u003c\/strong\u003e: Master the design of \u003cstrong\u003eInfinite Gain Multiple Feedback (MFB) filters\u003c\/strong\u003e for precision signal management. This technical guide provides the equations and IC recommendations needed to build high-performance low-pass, high-pass, and bandpass active filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Variable Frequency Equalizer\u003c\/strong\u003e: by Staff .......................................................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow to Found an Audio Group\u003c\/strong\u003e: by James B. Brinton and Charles P. Repka ................. \u003cstrong\u003e8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Taming Ampzilla with Walt Jung\u003c\/strong\u003e: by Walt Jung ............................................ \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeaker Evaluation: Ear or Machine? Part 2\u003c\/strong\u003e: by Roger H. Russell .............................. \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Moffet, Miller, Anderton and Colbert ........................................ \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOp Amps for Audio: Active Filters, Part 2\u003c\/strong\u003e: by Walt Jung ................................................ \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAd Index\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e44\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323934683350,"sku":"AA-2-1975","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/75_02_cover.jpg?v=1780600600"},{"product_id":"audio-amateur-3-1975-pdf","title":"Audio Amateur 3\/1975 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1975 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eIssue 3, 1975\u003c\/strong\u003e edition of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e is a technical powerhouse that bridges the gap between classic craftsmanship and the digital future. Here are the highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Bilateral Clipping Indicator\u003c\/strong\u003e: Stop guessing if your amplifier is struggling with transients. Build this real-time indicator that provides a visible warning whenever your system is driven to clipping—saving your speakers from damage and your ears from fatigue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Research: A Profile\u003c\/strong\u003e: Go behind the scenes with a legend. In this extensive interview, \u003cstrong\u003eWilliam Z. Johnson\u003c\/strong\u003e reveals the uncompromising design philosophy and rigorous testing that have made \u003cstrong\u003eAudio Research\u003c\/strong\u003e a world leader in \"state-of-the-art\" linearity and music reproduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Compact Tower\u003c\/strong\u003e: Achieve \"exceptional clarity and spaciousness\" without sacrificing your living room floor. These high-performance, \u003cstrong\u003eomni-directional towers\u003c\/strong\u003e provide an open, airy character and deep bass response that rivals far larger, more expensive conventional designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo Out of One\u003c\/strong\u003e: Master your home’s audio distribution. This clever control system allows you to manage \u003cstrong\u003etwo separate audio programs\u003c\/strong\u003e and multiple speaker sets across different rooms simultaneously, ensuring everyone in the house hears what they want.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Basics: What is PCM?\u003c\/strong\u003e: Peer into the \"undisputed\" future of audio. \u003cstrong\u003eReg Williamson\u003c\/strong\u003e explains the ground-breaking technology of Pulse Code Modulation (PCM) and how it promises to deliver \u003cstrong\u003eabsolute fidelity\u003c\/strong\u003e in broadcasting and recording.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: Electrostatic Monitoring\u003c\/strong\u003e: Explore a high-performance solution for on-location mastering. Roger Sanders shares his custom-built \u003cstrong\u003e20-watt Class A amplifier\u003c\/strong\u003e designed specifically to drive electrostatic headphones with stunning, \"veil-lifting\" transparency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn Defense of the Ear\u003c\/strong\u003e: Join the debate on how we truly evaluate sound. This provocative article challenges traditional loudspeaker measurement theories, arguing that \u003cstrong\u003etrained human hearing\u003c\/strong\u003e remains the ultimate tool for judging high-fidelity performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Heathkit XO-1\u003c\/strong\u003e: Reference a vintage pioneer. This issue features the complete, detailed schematic for the \u003cstrong\u003eHeathkit Electronic Crossover\u003c\/strong\u003e, a valuable resource for restorers and tube enthusiasts alike.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Bilateral Clipping Indicator\u003c\/strong\u003e: by C.W. Russell ..................................................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Research: A Profile\u003c\/strong\u003e: Interview with William Z. Johnson ............................................. \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Compact Tower\u003c\/strong\u003e: by Lynn B. Neal .................................................................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo Out of One\u003c\/strong\u003e: by Eric West ................................................................................................. \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Basics: What is PCM? Part I\u003c\/strong\u003e: by Reg Williamson ...................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Williams, Sommerwerck, Gunderson, Boyd, and Thoroman ...... \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: by R.H. Miller and Brent Gabrielsen .................................................................... \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase\u003c\/strong\u003e: Roger R. Sanders' electrostatic headphone system ........................................ \u003cstrong\u003e34\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn Defense of the Ear\u003c\/strong\u003e: by James S. Upton ............................................................................ \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Heathkit Electronic Crossover Model XO-1 ...................................... \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e41\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCORRECTIONS\u003c\/strong\u003e .......................................................................................................................... \u003cstrong\u003e42\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e45\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e45\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323939008726,"sku":"AA-3-1975","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/75_03_cover.jpg?v=1780600416"},{"product_id":"audio-amateur-4-1975-pdf","title":"Audio Amateur 4\/1975 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1975 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe fourth issue of \u003cstrong\u003e1975\u003c\/strong\u003e for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e celebrates the close of the magazine's fifth year with a heavy focus on precision test equipment, innovative room acoustics, and DIY electrostatic design. Here are the highlights:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMorrey's Super Oscillator\u003c\/strong\u003e: Achieve laboratory-grade precision on an amateur budget. Walter Morrey details how to modify the Heath IG-18 oscillator to reach near-ideal distortion levels—as low as .0005%—making it an essential tool for high-performance audio analysis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Stereo Delay Line\u003c\/strong\u003e: Bring the \"concert hall\" experience to your listening room. Douglas Preis provides a complete construction guide for an affordable, two-channel acoustical delay line that adds a stunning new dimension of spaciousness and reverberation to your music.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA.L.F. Garbage Filter\u003c\/strong\u003e: Clean up your signal with this versatile general-purpose filter card. Originally conceived as a 30Hz rumble filter, audio legend Walt Jung shows how this design can be adapted to handle almost any active filter task, from crossovers to subsonic suppression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Sanders Electrostatic Speaker\u003c\/strong\u003e: Experience the legendary transparency and detail of electrostatic sound. Roger Sanders provides a comprehensive, step-by-step guide to building your own full-range electrostatic panels, including the complex construction of wire stators and high-voltage polarizing supplies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is PCM? Part 2\u003c\/strong\u003e: Go inside the digital revolution. Reg Williamson continues his definitive look at Pulse Code Modulation, explaining the working principles of the BBC’s advanced sound distribution systems and how digital technology ensures absolute signal integrity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: This issue is packed with technical wisdom from readers, featuring a method for \u003cstrong\u003emeasuring crossover distortion\u003c\/strong\u003e in power amplifiers and a design for a \u003cstrong\u003etransformerless balanced output\u003c\/strong\u003e for professional-grade signal management.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: Study the engineering of a vintage icon. This issue includes the full, detailed schematic for the \u003cstrong\u003eMarantz Electronic Crossover\u003c\/strong\u003e, offering a valuable reference for tube enthusiasts and restorers of high-end vintage gear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMorrey's Super Oscillator\u003c\/strong\u003e: by Walter T. Morrey ................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Stereo Delay Line\u003c\/strong\u003e: by Douglas H. Preis .......................................................................... \u003cstrong\u003e10\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA.L.F. Garbage Filter\u003c\/strong\u003e: by Walt Jung ................................................................................... \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Sanders Electrostatic Speaker\u003c\/strong\u003e: by Roger R. Sanders .......................................... \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is PCM? Part 2\u003c\/strong\u003e: by Reg Williamson ........................................................................ \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Great American Sound, James A. Mears, and others ............ \u003cstrong\u003e34\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Marantz Electronic Crossover ....................................................... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e43\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e59\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48323943825622,"sku":"AA-4-1975","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/75_04_cover.jpg?v=1780600901"},{"product_id":"audio-amateur-1-1974-pdf","title":"Audio Amateur 1\/1974 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1974 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1974\u003c\/strong\u003e issue 1 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e  kicks off the magazine's fifth year with a heavy-hitting lineup of classic modifications and advanced electronic theory. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Perfectionist's PAS Preamp\u003c\/strong\u003e: Transform the classic \u003cstrong\u003eDyna PAS tube-type preamplifier\u003c\/strong\u003e into a state-of-the-art contender . David Vorhis details definitive modifications, including a \u003cstrong\u003eregulated power supply\u003c\/strong\u003e and circuit simplifications, that strip away \"graininess\" to reveal a natural balance and startling detail .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA High Efficiency Mid- and High Range Horn\u003c\/strong\u003e: Stop settling for mediocre, fuzzy transients in your speaker system . This project shows you how to build a \u003cstrong\u003efully horn-loaded enclosure\u003c\/strong\u003e for an inexpensive driver, achieving superior frequency response and the kind of \"punch\" that makes music sound like the real thing .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack to the Wall\u003c\/strong\u003e: Reclaim your floor space without sacrificing high-end transparency . Alan Watling demonstrates how to \u003cstrong\u003emount high-performance KEF and ribbon drivers directly into your walls\u003c\/strong\u003e, utilizing a \"rigid\" infinite baffle effect for a massive sound stage and deep, subtle bass .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Op Amps for Audio\u003c\/strong\u003e: Master the technical foundations of modern audio design . Legend Walt Jung goes \u003cstrong\u003e\"Back to the Basics\"\u003c\/strong\u003e with a deep dive into IC specifications, teaching you how to interpret manufacturer data sheets to select the perfect components for your custom projects .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Understand the critical bridge between voltage and power . This installment explores the \u003cstrong\u003emathematics of power gain and impedance matching\u003c\/strong\u003e, providing the essential knowledge needed to design efficient, high-performance multi-stage transistor amplifiers .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: This issue is packed with DIY ingenuity, from a clever \u003cstrong\u003e\"Stylus Saver\" for AR turntables\u003c\/strong\u003e to advanced \u003cstrong\u003ecooling techniques for \"Tiger\" amplifiers\u003c\/strong\u003e and high-performance \"souped-up\" op amp output circuits .\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Perfectionist's PAS Preamp\u003c\/strong\u003e: by David Vorhis ................................................................ \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA High Efficiency Mid- and High Range Horn\u003c\/strong\u003e: by James Nicholson ............................. \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack to the Wall\u003c\/strong\u003e: by Alan Watling ..................................................................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: by readers Harris, Ferrand, and Anderton ............................... \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Op Amps for Audio\u003c\/strong\u003e: by Walt Jung ............................................................................... \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: by C.N.G. Matthews ........................................................ \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking\u003c\/strong\u003e .......................................................................................................................... \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvertiser Index\u003c\/strong\u003e ................................................................................................................... \u003cstrong\u003e15\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48324144955606,"sku":"AA-1-1974","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/74_01_cover.jpg?v=1780604936"},{"product_id":"audio-amateur-2-1974-pdf","title":"Audio Amateur 2\/1974 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1974 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1974 issue 2 of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e marks a milestone in DIY audio, offering professional-grade console designs and a comprehensive look at the quadraphonic revolution. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn IC Preamp\/Console\u003c\/strong\u003e: Stop settling for \"all-in-one\" systems and build a \u003cstrong\u003eprofessional quality audio console\u003c\/strong\u003e designed to be the collector and distributor for every sound source in your system. This modular powerhouse features \u003cstrong\u003e13 separate amplifiers\u003c\/strong\u003e, including dedicated circuits for mixing, monitoring, and even live microphones.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eW(h)ither Quadraphonics?\u003c\/strong\u003e: Get the definitive report on the state of \u003cstrong\u003efour-channel sound\u003c\/strong\u003e. This deep dive evaluates the competing matrix and discrete CD-4 systems, providing expert analysis on the latest \u003cstrong\u003edemodulators, cartridges, and specialized styli\u003c\/strong\u003e needed to achieve a true \"illusion of reality\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRegulated \u0026amp; Current Limiting Power Supplies\u003c\/strong\u003e: Eliminate hum and bias shift with a family of sophisticated \u003cstrong\u003eregulated power supplies\u003c\/strong\u003e. These designs offer versatile outputs from 16 to 68 Volts and include \u003cstrong\u003eactive current limiting\u003c\/strong\u003e to protect your expensive output transistors from accidental shorts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Op Amps for Audio\u003c\/strong\u003e: Master the technical foundations of modern circuitry with Walt Jung. This installment focuses on critical dynamic characteristics like \u003cstrong\u003eslew rate and gain bandwidth product\u003c\/strong\u003e, and even includes a schematic for a \u003cstrong\u003ehandy IC tester\u003c\/strong\u003e you can build to verify your components are functional.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Explore the \"designer’s dream\"—the \u003cstrong\u003eField-Effect Transistor (FET)\u003c\/strong\u003e. Learn how these devices mimic the desirable characteristics of pentode tubes and how to implement them in common source and follower configurations for high-performance audio applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids and Comfort\u003c\/strong\u003e: This issue is packed with practical workshop wisdom, from \u003cstrong\u003erepairing Teac tape decks\u003c\/strong\u003e to achieving a \u003cstrong\u003eprofessional finish on equipment panels\u003c\/strong\u003e and a clever trick for drilling perfectly round holes in sheet metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn IC Preamp\/console: Part one\u003c\/strong\u003e: by Richard Kunc ........................................................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eW(h)ither Quadraphonics?\u003c\/strong\u003e: by B. V. Pisha .......................................................................... \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Family of Regulated \u0026amp; Current Limiting Power Supplies\u003c\/strong\u003e: by Joshua I. Goldberg ... \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids and Comfort\u003c\/strong\u003e: by readers Resler, Gilmore, and Gloeckler .......................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Op Amps for Audio\u003c\/strong\u003e: by Walt Jung .................................................................................. \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: by C.N.G. Matthews .......................................................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ........................................................................................................................................ \u003cstrong\u003e27\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvertiser Index\u003c\/strong\u003e ................................................................................................................... \u003cstrong\u003e27\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e29\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48324166025430,"sku":"AA-2-1974","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/74_02_cover.jpg?v=1780605118"},{"product_id":"audio-amateur-3-1974-pdf","title":"Audio Amateur 3\/1974 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1974 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eIssue 3 of \u003cstrong\u003e1974\u003c\/strong\u003e (Volume V, Number 1) for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e delivers a powerful collection of high-end console engineering and foundational electronics theory. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign Your Own Switch-\u0026amp;-Jack Panel\u003c\/strong\u003e: Stop the \"cable-swapping madness.\" Craig Stark explains how to build a professional-grade patch bay to manage multiple tape decks, tuners, and noise-reduction systems with total flexibility and a clean signal path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn IC Preamp\/Console (Part Two)\u003c\/strong\u003e: Take the next step in professional recording. Richard Kunc provides the blueprints for building a custom, modular audio console featuring sophisticated mixing logic, cue systems, and dedicated RIAA preamps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding in Audio Equipment\u003c\/strong\u003e: Silence the hum once and for all. This technical deep dive explores the \"ground rules\" of audio engineering, teaching you how to properly isolate signal, power, and chassis grounds to achieve a pristine noise floor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOn Measuring Frequency Response\u003c\/strong\u003e: Master the art of precision measurement. This guide identifies the four most common sources of error in frequency response testing and explains how to use a calibrated attenuator for laboratory-grade accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors (Part 13)\u003c\/strong\u003e: Bridge the gap between vacuum tubes and solid-state. This installment details the physics and circuit applications of the \u003cstrong\u003eMOSFET\u003c\/strong\u003e, explaining why these devices are a \"designer's dream\" for high-performance audio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Electret Microphone Kit\u003c\/strong\u003e: Can a $42 DIY kit deliver professional results? Richard Honeycutt puts the Electronic Enterprises electret microphone to the test, evaluating its frequency response and suitability for on-location recording.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids: The Dynaco PAT-4 \u0026amp; AR Turntable\u003c\/strong\u003e: This issue features essential DIY optimizations, from using computer modeling to perfect the \u003cstrong\u003eDynaco PAT-4's\u003c\/strong\u003e RIAA equalization to installing precision ball-bearing pivots in the classic \u003cstrong\u003eAR tonearm\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: Expand your technical library. R.H. Miller reviews essential new texts on FET projects, semiconductor physics, and electronic instrumentation for the serious home builder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial: The \"Knotty Mystery\" of Reviews\u003c\/strong\u003e: Editor Edward T. Dell, Jr. explores why big audio magazines rarely publish unfavorable reviews and discusses the forum on Hi-Fi equipment testing held at the 49th AES Convention.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial\u003c\/strong\u003e: The \"Knotty Mystery\" of Reviews by Edward T. Dell, Jr. ..................................... \u003cstrong\u003e2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign Your Own Switch-\u0026amp;-Jack Panel\u003c\/strong\u003e: by Craig L. Stark ............................................. \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOn Measuring Frequency Response\u003c\/strong\u003e ................................................................................... \u003cstrong\u003e8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn IC Preamp\/Console: Part Two\u003c\/strong\u003e: by Richard Kunc ........................................................ \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding in Audio Equipment\u003c\/strong\u003e: by Paul L. Taylor .......................................................... \u003cstrong\u003e15\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids\u003c\/strong\u003e: by readers Carlstrom, Taylor, and Miles ........................................................ \u003cstrong\u003e18\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cem\u003eECAP'ing the PAT-4 Revisited\u003c\/em\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eAR Pivots Improved\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: by R. H. Miller ...................................................................................................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors: Part 13\u003c\/strong\u003e: by C.N.G. Matthews ............................................ \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Electret Microphone Kit\u003c\/strong\u003e: by Richard A. 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Here are the highlights of this anniversary edition:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial: Five Years and the Power Struggle\u003c\/strong\u003e: Reflect on the magazine's first five years and dive into the high-stakes battle between \u003cstrong\u003eDynaco and the FTC\u003c\/strong\u003e over controversial new amplifier power rating regulations .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoore’s Precision Preamp\u003c\/strong\u003e: Build a high-performance, low-level building block for your magnetic phonograph cartridges or tape play heads. This versatile circuit is optimized for \u003cstrong\u003elow noise, high gain, and extreme accuracy\u003c\/strong\u003e in frequency compensation .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSME Shell Surgery\u003c\/strong\u003e: Don't let excess mass muddy your sound. Learn how to perform precision \"surgery\" on your \u003cstrong\u003eSME 3009 headshell\u003c\/strong\u003e to reduce dynamic mass, significantly improving the tracking of modern high-compliance cartridges .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Regulated Power\u003c\/strong\u003e: Master the art of \"electronic\" hum removal. Walt Jung continues his definitive series on op amps, providing schematics for \u003cstrong\u003ehigh-performance voltage regulators\u003c\/strong\u003e that deliver the ultra-stable, ripple-free power required for top-tier audio .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn IC Preamp Operation Manual\u003c\/strong\u003e: Now that you’ve built the TAA IC console, learn how to \"fly\" it. This detailed guide covers everything from managing \u003cstrong\u003ecue sends and master faders\u003c\/strong\u003e to professional techniques for aligning your tape recorders .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: Discover ingenious reader-submitted solutions, including a proposal for a \u003cstrong\u003ehigh-frequency tube power supply\u003c\/strong\u003e and a clever \"kitchen-table surgery\" technique for repairing broken AC adapter wires .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: SWTP Headphone Amplifier\u003c\/strong\u003e: Get the expert verdict on Southwest Technical Products' \u003cstrong\u003eClass A headphone amp\u003c\/strong\u003e. This report evaluates its \"clean, open\" sound and offers critical advice on managing its considerable heat dissipation .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: A Slide Show Saga\u003c\/strong\u003e: Elevate your multimedia presentations. Learn the professional secrets of \u003cstrong\u003esynchronizing audio narration and music\u003c\/strong\u003e with slides, including expert tips on scriptwriting and final editing .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry: The Marantz 7C\u003c\/strong\u003e: Study the engineering of a true audio icon. This issue includes the \u003cstrong\u003ecomplete, detailed schematic\u003c\/strong\u003e for the Marantz 7C Stereo Preamplifier, an essential reference for restorers and tube enthusiasts .\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEditorial\u003c\/strong\u003e: Take Five and Overzealous Overshoot ................................................................ \u003cstrong\u003e2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Preamp for Magnetic Phonograph Cartridges and Tape Play Heads\u003c\/strong\u003e: by Richard R. Moore ................................................................................................................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSME Shell Surgery\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ................................................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Regulated Power, Part III\u003c\/strong\u003e: by Walt Jung ...................................................................... \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn IC Preamp, Part 3: Operation Manual\u003c\/strong\u003e: by Richard A. Kunc ........................................ \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: by readers Buvel and Levitt ........................................................ \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: SWTP Headphone Amplifier\u003c\/strong\u003e: by Damon Hill ................................................. \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: A Slide Show Saga\u003c\/strong\u003e: by James K. Jobson .................................................... \u003cstrong\u003e33\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Circuitry\u003c\/strong\u003e: The Marantz 7C Stereo Preamplifier ..................................................... \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e45\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48324200235222,"sku":"AA-4-1974","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/74_04_cover.jpg?v=1780605552"},{"product_id":"audio-amateur-1-1973-pdf","title":"Audio Amateur 1\/1973 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1973 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe first issue of \u003cstrong\u003e1973\u003c\/strong\u003e (Volume IV, Number 1) for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e marks a major milestone as the magazine began its first year of full-time publication. Here are the technical highlights of this issue:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Transmission Line Speaker\u003c\/strong\u003e: Achieve non-resonant, deep bass response that \"bookshelf\" speakers simply can't touch. Theodore Jastak provides the blueprints and comparative driver ratings to help you build a \"true\" transmission line enclosure for 8\", 10\", or 12\" woofers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Peak-Reading Level Meter\u003c\/strong\u003e: Stop letting sudden transients ruin your recordings. Thomas Parsons presents a sophisticated peak-detection circuit that captures the \"instantaneous\" peaks sluggish VU meters miss, allowing you to record at maximum fidelity without distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Listening Machines\u003c\/strong\u003e: Navigate the complex world of microphones with Richard Honeycutt. From the legendary \"warmth\" of ribbon mics to the precision of modern condensers and the DIY-friendly electret, learn which microphone is best suited for your specific recording needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Matching Myth\u003c\/strong\u003e: Is everything you know about \"impedance matching\" wrong? Reginald Williamson \"unpacks\" common phono input mysteries, showing you how to properly load your cartridge for a flat frequency response and optimal signal-to-noise ratio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the critical science of \u003cstrong\u003eBias and Stabilization\u003c\/strong\u003e. Learn the physics behind \"thermal runaway\" and discover how to design stable circuits that keep your transistors performing perfectly even as they heat up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: Tap into the collective ingenuity of the \u003cem\u003eTAA\u003c\/em\u003e community. This issue features reader-submitted hacks for optimizing the \u003cstrong\u003eDynaco PAT-4\u003c\/strong\u003e, \"sleuthing\" out tape deck design errors, and building professional-looking \"mini-box\" cabinets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmission Line Speaker\u003c\/strong\u003e: by J. Theodore Jastak ................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Peak-Reading Level Meter\u003c\/strong\u003e: by Thomas W. Parsons ........................................................ \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Listening Machines: Part II\u003c\/strong\u003e: by Richard A. Honeycutt ............................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: by readers Hazlehurst, Taylor, Ornsteen, and others .................. \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals: The Matching Myth, Part II\u003c\/strong\u003e: by Reginald Williamson .................. \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors, Part 12: Bias and Stabilization\u003c\/strong\u003e: by C.N.G. Matthews ...... \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ........................................................................................................................................ \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking\u003c\/strong\u003e .............................................................................................................................. \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAd Index\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328286634198,"sku":"AA-1-1973","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/73_01_c.jpg?v=1780687680"},{"product_id":"audio-amateur-1-1973-pdf-copy","title":"Audio Amateur 2\/1973 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1973 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/73-2-Audio_Amateur_Engineering_Magazine.png?v=1780688410\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe second issue of \u003cstrong\u003e1973\u003c\/strong\u003e for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e (Issue 2\/1973) is a masterclass in precision DIY engineering, featuring everything from radical tonearm designs to sophisticated noise reduction. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Dynamic Hiss Filter\u003c\/strong\u003e: Conquer the \"shadowy\" noise of SCA signals and old 78s without losing musical clarity . Jack Hazlehurst, Jr. presents a sophisticated \"systems approach\" to design, providing a circuit that intelligently opens and closes its bandwidth based on the program material to keep your music bright and the hiss at bay .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Do-It-Yourself Tonearm\u003c\/strong\u003e: Can a home-built tonearm outperform world-class commercial units? Legend Roger Sanders details how to build a precision, low-friction arm using model racing car bearings and a unique magnetic anti-skating system for less than $10 .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIGOR: Washer for Dirty Discs\u003c\/strong\u003e: Eliminate surface noise and \"discpan hands\" with a high-power vacuum record cleaning machine . Kurt Wiley shows you how to repurpose a household compressor and laboratory flasks into a professional-grade cleaning system that pulls deep-seated grit out of your grooves in seconds .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Op Amps for Audio\u003c\/strong\u003e: Master the foundations of modern solid-state circuitry . Audio pioneer Walt Jung demystifies the integrated circuit operational amplifier, teaching you how to achieve laboratory-grade performance and precision in your custom projects with a minimum of investment .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGoing Sound Fishing\u003c\/strong\u003e: Discover the \"overwhelming superiority\" of live recording . Professional recordist Gerry Turner provides a practical guide for the amateur enthusiast on finding local bands, selecting the best microphones, and the technical art of capturing a first-rate ensemble performance in its natural environment .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors: Part 13\u003c\/strong\u003e: Master the critical science of thermal stability in single-stage amplifiers . This installment explains the physics behind \"thermal runaway\" and provides the essential mathematics to design stable, high-performance circuits that stay reliable as they heat up .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: This issue is packed with reader-submitted ingenuity, including a sophisticated \u003cstrong\u003eMulti-Dolby switching system\u003c\/strong\u003e, a DIY fix for \u003cstrong\u003eflickering neon pilot lights\u003c\/strong\u003e, and modifications for adding \u003cstrong\u003eextra speakers to the Heath AR-1500\u003c\/strong\u003e .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTechnical Supplements\u003c\/strong\u003e: Deepen your engineering knowledge with specialized reports on \u003cstrong\u003eThyristor Supply calculations\u003c\/strong\u003e for power regulation and a detailed look at \u003cstrong\u003eThe Design Process\u003c\/strong\u003e for building electrically tunable low-pass filters .\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Dynamic Hiss Filter\u003c\/strong\u003e: by Jack H. Hazlehurst, Jr. ................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Do-It-Yourself Tonearm\u003c\/strong\u003e: by Roger R. Sanders ................................................................ \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIGOR: Washer for Dirty Discs\u003c\/strong\u003e: by Kurt M. Wiley ................................................................ \u003cstrong\u003e15\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: by readers Furbush, Day, and Levin ............................................. \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Going Sound Fishing\u003c\/strong\u003e: by Gerry L. Turner ..................................................... \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIC Op Amps for Audio\u003c\/strong\u003e: by Walt Jung .................................................................................. \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors: Part 13\u003c\/strong\u003e: by C.N.G. Matthews ............................................... \u003cstrong\u003e32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e34\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Thyristor Supply (Technical Supplement)\u003c\/strong\u003e ........................................................................ \u003cstrong\u003e40\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Design Process (Technical Supplement)\u003c\/strong\u003e ...................................................................... \u003cstrong\u003e41\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ................................................................................................................................ \u003cstrong\u003e45\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328302002390,"sku":"AA-2-1973","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/73_02_cover.jpg?v=1780688109"},{"product_id":"audio-amateur-3-1973-pdf","title":"Audio Amateur 3\/1973 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1973 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eIssue 3 of \u003cstrong\u003e1973\u003c\/strong\u003e (Volume IV, Number 3) for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e is a visual and technical feast, bridging the gap between electronic theory and the physical reality of sound waves. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow to Photograph Sound\u003c\/strong\u003e: Ever wanted to \u003cem\u003esee\u003c\/em\u003e your music? Discover the fascinating world of sound wave photography. Learn how to build a motor-driven scanning rig that uses a neon bulb to map out sound patterns and diffraction, revealing exactly how your speakers are interacting with your listening room,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrostatic Amplifier Mark 2\u003c\/strong\u003e: Take your high-end transparency to the next level. David Hermeyer unveils critical modifications to his acclaimed electrostatic amplifier design, slashing distortion through ingenious \"common mode\" feedback techniques that result in improved resolution and clarity,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Super Brute\u003c\/strong\u003e: Build a 120-watt tube powerhouse that lives up to its name. Based on the legendary Dyna Mark III but featuring a \"stiff\" military-grade power supply and refined bias circuitry, this beast provides stunning musicality and authoritative control over even the most demanding speakers,,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals—About Equalization\u003c\/strong\u003e: Why do your records need a specialized \"replay curve\" to sound right? Reg Williamson demystifies the physics of the vinyl groove, explaining the absolute necessity of RIAA equalization and how to optimize your phono stage for absolute fidelity,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the \"common-emitter\" amplifier. This practical installment provides a step-by-step working example, showing you how to design stable, high-performance solid-state stages that resist thermal drift and provide reliable gain,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: Precision signal control doesn't have to be a mystery. Learn how to design and build custom ladder attenuators—including a space-saving \"pancake\" layout—to achieve professional-grade accuracy and constant impedance in your signal path,.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow to Photograph Sound\u003c\/strong\u003e: by Edward H. Parker ................................................................ \u003cstrong\u003e2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrostatic Amplifier Mark 2\u003c\/strong\u003e: by David P. Hermeyer ..................................................... \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Super Brute\u003c\/strong\u003e: by L.C. Landers .......................................................................................... \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals—About Equalization\u003c\/strong\u003e: by Reginald Williamson ............................ \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Aids \u0026amp; Comfort\u003c\/strong\u003e: by readers Parsons, Hazlehurst, and Bryant .............................. \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors—Part 14\u003c\/strong\u003e: by C.N.G. Matthews ........................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e .............................................................................................................................. \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328437039318,"sku":"AA-3-1973","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/73_03_cover.jpg?v=1780689308"},{"product_id":"audio-amateur-4-1973-pdf","title":"Audio Amateur 4\/1973 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1973 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1973 issue 4 of \u003cem\u003eThe Audio Amateur \u003c\/em\u003ecloses out the year with a focus on high-power amplification, precision recording tools, and foundational engineering theory. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Listening Machines: Part 1\u003c\/strong\u003e: Embark on a journey into the world of microphones. Richard Honeycutt explores the fascinating history and complex working principles of the devices that stand at the beginning of every recording chain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Modified Dolby B\u003c\/strong\u003e: Transform your Advent 101 into a professional-grade tool. Fred Gloeckler provides a detailed guide to modifying this classic unit, slashes distortion, and expanding frequency response for serious live recording sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduce Speaker Distortion by Tuning a Pipe\u003c\/strong\u003e: Audio innovator Nelson Pass presents a creative new application for the bass reflex principle. Learn how \"tuning a pipe\" can significantly lower distortion in your loudspeaker enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Electrostatic Speaker System: Part II\u003c\/strong\u003e: Experience the sheer authority of high-voltage sound. David Hermeyer unveils a massive \u003cstrong\u003e900-watt amplifier\u003c\/strong\u003e designed to be coupled directly to electrostatic panels for unparalleled transparency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Power Doubler\u003c\/strong\u003e: Craving more power for your 4-ohm loads? John E. Hill shares a clever technical \"trick\" using inverters to effectively \u003cstrong\u003edouble the power delivery\u003c\/strong\u003e of your existing amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultipath Distortion\u003c\/strong\u003e: Master your FM tuner's performance. Learn how to use an oscilloscope to visualize and eliminate the signal-degrading reflections that cause multipath distortion, ensuring pristine radio reception.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals: The Matching Myth\u003c\/strong\u003e: Reginald Williamson returns to debunk common misconceptions about impedance. Discover how to properly load your components to achieve a truly flat frequency response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the art of small signal design. This installment provides the critical equations and biasing techniques needed to build stable, high-performance amplifiers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: Build your technical library with confidence. R.H. Miller evaluates essential texts on everything from basic electricity to advanced integrated circuit applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Techniques\u003c\/strong\u003e: Tap into the collective wisdom of the \u003cem\u003eTAA\u003c\/em\u003e community. This issue features ingenious hacks for \u003cstrong\u003eDynaco PAT-4 capacitor upgrades\u003c\/strong\u003e, Rabco tonearm improvements, and essential circuit board mounting techniques.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Listening Machines: Part 1\u003c\/strong\u003e: by Richard A. Honeycutt ........................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Modified Dolby B\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ................................................................ \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduce Speaker Distortion by Tuning a Pipe\u003c\/strong\u003e: by Nelson Pass .................................... \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Electrostatic Speaker System: Part II\u003c\/strong\u003e: by David P. Hermeyer ............................. \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Power Doubler\u003c\/strong\u003e: by John E. Hill ....................................................................................... \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBook Talk\u003c\/strong\u003e: by R.H. Miller ................................................................................................... \u003cstrong\u003e15\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Taylor, Hazlehurst, Wiley and others .......................... \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals: The Matching Myth\u003c\/strong\u003e: by Reginald Williamson .......................... \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultipath Distortion\u003c\/strong\u003e: by Robert E. Berglas .................................................................... \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors: Part 11\u003c\/strong\u003e: by C.N.G. Matthews .......................................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e27\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e ..................................................................................................................... \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAD INDEX\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328571322582,"sku":"AA-4-1973","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/73_04_cover.jpg?v=1780694162"},{"product_id":"audio-amateur-1-1972-pdf","title":"Audio Amateur 1\/1972 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1972 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/1972-Issue1-AudioAmateur.png?v=1780696141\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"message-text-content mat-body-medium\" aria-live=\"polite\"\u003e\n\u003cdiv class=\"paragraph normal ng-star-inserted\" data-start-index=\"0\"\u003e\n\u003cp\u003eThe 1972 issue 1 of \u003cem\u003eThe Audio Amateur \u003c\/em\u003emarks a bold step forward in precision DIY audio, offering high-performance equalization and studio-grade recording tools. Here are the highlights to entice your inner audio enthusiast:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Audio Amateur's Octalizer\u003c\/strong\u003e: Move beyond standard tone controls that only provide a \"blanket\" boost. Reginald Williamson introduces a professional-grade \u003cstrong\u003eoctave equalizer\u003c\/strong\u003e using active circuitry to fix specific room resonances or cartridge frequency aberrations, providing the transparency your system deserves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe American Prototype\u003c\/strong\u003e: Take the guesswork out of your build. The \u003cem\u003eTAA\u003c\/em\u003e staff provides a detailed construction log for an American version of the Octalizer, featuring tips on \u003cstrong\u003emounting slide pots\u003c\/strong\u003e and optimizing power supply arrangements for the lowest possible noise floor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Simple Shock Mount for your Microphone\u003c\/strong\u003e: Stop letting \"thumping\" footsteps ruin your quiet musical passages. Roger Sanders shares a DIY guide to building an inexpensive, \u003cstrong\u003elow-profile shock mount\u003c\/strong\u003e from hobby shop materials to isolate your sensitive microphone for studio-clean recordings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Super Op-Amp Preamp\u003c\/strong\u003e: Elevate your signal chain. This design by Daniel Meyer leverages high-performance ICs to overcome the limitations of standard preamps, achieving \u003cstrong\u003eexceptional linearity and ultra-low distortion\u003c\/strong\u003e even at extreme low frequencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Record Compensation\u003c\/strong\u003e: Master the art of the perfect tape. Learn how to use versatile pre-amp controls to intelligently compensate for vocal tracks and \u003cstrong\u003emix narration with music\u003c\/strong\u003e for professional-sounding home recordings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Phase Corporation ASG-200\u003c\/strong\u003e: Say goodbye to the \"tedium\" of point-by-point graphing. This report evaluates an inexpensive \u003cstrong\u003esweep\/function generator\u003c\/strong\u003e that allows you to visualize frequency response curves instantly on an oscilloscope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: Gain a competitive edge in the workshop with clever reader-submitted hacks, including a way to \u003cstrong\u003eimprove DIY circuit board etching\u003c\/strong\u003e and critical thermal stability fixes for \"Tiger\" power amplifiers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: Superior Audio Craftsmanship\u003c\/strong\u003e: Get inspired by Alan Watling’s \"20\/20\" integrated unit, a masterwork of engineering that combines a \u003cstrong\u003epreamp, power amp, and Octalizer\u003c\/strong\u003e into one stunningly crafted custom package.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Build your engineering foundation. This installment breaks down the \u003cstrong\u003ecommon-emitter amplifier\u003c\/strong\u003e, teaching you how to manage input resistance and gain for distortion-free signal amplification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEar Demolition\u003c\/strong\u003e: Protect your most valuable audio asset. This startling research report examines how high-intensity music is causing \u003cstrong\u003epermanent hearing loss\u003c\/strong\u003e in young people and provides essential guidelines for safe listening.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Audio Amateur’s Octalizer\u003c\/strong\u003e: by Reginald Williamson ........................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe American Prototype\u003c\/strong\u003e: by the Staff ................................................................................ \u003cstrong\u003e8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Simple Shock Mount for your Microphone\u003c\/strong\u003e: by Roger R. Sanders ........................ \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Super Op-Amp Preamp\u003c\/strong\u003e: by Daniel Meyer ................................................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Record Compensation\u003c\/strong\u003e: by James K. Jobson .......................................... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Phase Corporation’s ASG-200 Sweep\/Function Generator\u003c\/strong\u003e ............. \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Watson, Rossmassler, Repka and Greene .................... \u003cstrong\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShowcase: Superior audio craftsmanship\u003c\/strong\u003e: Alan Watling ............................................... \u003cstrong\u003e33\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: by C.N.G. Matthews ........................................................ \u003cstrong\u003e34\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEar Demolition\u003c\/strong\u003e: by David M. Lipscomb ............................................................................. \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e37\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e ..................................................................................................................... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328572338390,"sku":"AA-1-1972","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/72_01_c.jpg?v=1780694450"},{"product_id":"audio-amateur-2-1972-pdf","title":"Audio Amateur 2\/1972 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1972 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe second issue of \u003cstrong\u003e1972\u003c\/strong\u003e for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e (Issue 2\/1972) is a technical powerhouse, featuring innovative DIY engineering from professional-grade tape decks to high-precision signal controls. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilding a 10 1\/2\" Reel Tape Deck\u003c\/strong\u003e: Stop dreaming of high-capacity recording and start building. Roger Sanders provides a comprehensive guide to constructing a \u003cstrong\u003eprofessional-quality playback deck\u003c\/strong\u003e with 10 1\/2\" reel capacity for a fraction of the cost of commercial units, utilizing ingenious design shortcuts and surplus parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Crossovers\u003c\/strong\u003e: Experience the \"ultimate in sound quality\" by moving your crossovers ahead of your power amplifiers . This article explores the theory of \u003cstrong\u003eactive and passive signal dividers\u003c\/strong\u003e, providing schematics and a detailed reactance chart to help you design a multi-amplifier system that slashes intermodulation distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepped Attenuators\u003c\/strong\u003e: Achieve the precision of a laboratory with your volume controls. Learn how to design and build a \u003cstrong\u003e23-position level control\u003c\/strong\u003e using a special etched circuit board to ensure your stereo channels track perfectly within ±1dB.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Denoising\u003c\/strong\u003e: Conquer the \"hiss\" that plagues your recordings. James K. Jobson breaks down the sources of tape noise and provides expert advice on utilizing \u003cstrong\u003eDolby systems and high-output tapes\u003c\/strong\u003e to achieve studio-quiet backgrounds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Deepen your understanding of solid-state physics. This installment focuses on \u003cstrong\u003ebasic amplifier circuits\u003c\/strong\u003e, explaining the mechanics of common-emitter and common-base configurations to help you maximize power gain in your custom designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: Discover a wealth of workshop wisdom from the \u003cem\u003eTAA\u003c\/em\u003e community, featuring critical \u003cstrong\u003ethermal stability fixes for \"Tiger\" amplifiers\u003c\/strong\u003e, instructions for building a non-inductive dummy load, and a clever \u003cstrong\u003e\"blend\" control modification\u003c\/strong\u003e for the Dynaco PAT-4.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilding a 10 1\/2\" Reel Tape Deck\u003c\/strong\u003e: by Roger R. Sanders .......................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Crossovers\u003c\/strong\u003e: by E.T. Dell Jr. and J.I. Goldberg ............................................. \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepped Attenuators\u003c\/strong\u003e: by Fred M. Gloeckler, Jr. ............................................................. \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Wiley, Hitt, Gloeckler, Novack, and Marovich ............ \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Denoising\u003c\/strong\u003e: by James K. Jobson ................................................................. \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmendments \u0026amp; Corrections\u003c\/strong\u003e: Williamson tape amp.; super op-amp; New Octalizer .... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to use Transistors: Part 9\u003c\/strong\u003e: by C.N.G. Matthews ............................................ \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e25\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADVERTISER INDEX\u003c\/strong\u003e ................................................................................................................ \u003cstrong\u003e25\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ..................................................................................................................................... \u003cstrong\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328643018966,"sku":"AA-2-1972","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/72_02_c.jpg?v=1780696270"},{"product_id":"audio-amateur-3-1972-pdf","title":"Audio Amateur 3\/1972 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1972 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eIssue 3, 1972\u003c\/strong\u003e edition of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e is a technical tour de force, featuring revolutionary amplifier concepts, DIY high-end speakers, and essential modifications for popular gear. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Edwin A+B Amplifier\u003c\/strong\u003e: Discover a revolutionary \"true Class-B\" design that achieves negligible crossover distortion without the need for temperature stabilization or matched transistors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImprove your Heath AR-15 or AR-1500\u003c\/strong\u003e: Unlock the hidden potential of your Heath receiver with professional-grade modifications that fix \"muddy\" bass, improve signal-to-noise ratios, and refine the tuning meter for peak performance .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Electrostatic Speaker System (Part 1)\u003c\/strong\u003e: Stop dreaming about electrostatic transparency and start building. Learn how to construct high-performance, full-range panels for a fraction of the cost of commercial units .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimizing the Tiger 175-A\u003c\/strong\u003e: Give your \"Universal Tiger\" a performance boost with new protection circuits and improved square-wave response for cleaner transients and increased reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: Master the art of the workshop with reader-submitted hacks for adding inputs to preamps, an \"ethical\" loudness control, and dramatically improving the audio quality of your TV set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals: The Mystery of Impedance\u003c\/strong\u003e: Reginald Williamson demystifies one of audio's most misunderstood topics, explaining the core principles of resistance and reactance while debunking the \"myth\" of impedance matching .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors (Part 10)\u003c\/strong\u003e: Take control of your circuit designs by mastering h-parameters. Learn how to interpret manufacturer data sheets to design stable, high-performance small-signal amplifiers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrahms Vindicated\u003c\/strong\u003e: Experience the thrill and technical challenge of recording a full choir and orchestra on amateur equipment in this inspiring and informative account.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Edwin A+B amplifier\u003c\/strong\u003e: by Piet Lambrechts ................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImprove your Heath AR-15 or AR-1500\u003c\/strong\u003e: by A. B. Krueger ............................................ \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Electrostatic Speaker System (Part 1)\u003c\/strong\u003e: by David P. Hermeyer ............................. \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimizing the Tiger 175-A\u003c\/strong\u003e: by Daniel Meyer ............................................................... \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Springer, Wade, Miner and Hazlehurst ........................ \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals: Impedance\u003c\/strong\u003e: by Reginald Williamson .......................................... \u003cstrong\u003e27\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors: Part 10 (H-Parameters)\u003c\/strong\u003e: by C.N.G. Matthews ............ \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrahms Vindicated (My Most Valuable Recording)\u003c\/strong\u003e: by L. C. Landers ........................ \u003cstrong\u003e36\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking\u003c\/strong\u003e ........................................................................................................................ \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e38\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328660222166,"sku":"AA-3-1972","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/72_03_c.jpg?v=1780696412"},{"product_id":"audio-amateur-4-1972-pdf","title":"Audio Amateur 4\/1972 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1972 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe final issue of \u003cstrong\u003e1972\u003c\/strong\u003e (\u003cem\u003eThe Audio Amateur\u003c\/em\u003e, Issue 4) is a technical powerhouse that concludes the magazine's second year with a heavy focus on high-power amplification, precision microphone theory, and radical speaker tuning.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Listening Machines\u003c\/strong\u003e: Embark on a comprehensive journey into microphone technology. This definitive guide covers everything from Bell’s earliest 1876 transducers to the sophisticated physics of ribbon, condenser, and dynamic microphones.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduce Speaker Distortion by Tuning a Pipe\u003c\/strong\u003e: Stop settling for \"muddy\" bass. Audio innovator \u003cstrong\u003eNelson Pass\u003c\/strong\u003e demonstrates how tuning a bass-reflex enclosure to a specific \"pipe\" length can significantly lower harmonic distortion—sometimes by as much as 1% at high power levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Electrostatic Speaker System (Part II)\u003c\/strong\u003e: Build the \"ultimate\" amplifier for your electrostatic panels. David Hermeyer unveils a massive, \u003cstrong\u003e105-pound, direct-coupled Class A tube amplifier\u003c\/strong\u003e utilizing high-voltage transmitting tubes to achieve stunning transparency without the need for output transformers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals: The Matching Myth\u003c\/strong\u003e: Master the \"thorny subject\" of impedance. Reginald Williamson debunks common misconceptions about impedance matching in audio systems, teaching you how to properly load your sources for the most accurate signal transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Deepen your engineering foundation with a focus on \u003cstrong\u003eSmall Signal Amplifiers\u003c\/strong\u003e. This installment explores the physics of input characteristics and load lines to help you design stable, distortion-free solid-state stages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: Discover essential workshop wisdom, including a critical study on how \u003cstrong\u003espeaker fuses impact your amplifier's damping factor\u003c\/strong\u003e and a clever microswitch modification to add \u003cstrong\u003eauto-shutoff to the Rabco ST-4 turntable\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Manifesto for Audio Amateurs\u003c\/strong\u003e: Revisit the philosophical core of the hobby with this declaration of independence for the audio avocation, emphasizing the value of DIY craftsmanship over commercial mass-production.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Manifesto for Audio Amateurs\u003c\/strong\u003e ..................................................................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Listening Machines: Part I\u003c\/strong\u003e: by Richard A. Honeycutt ........................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduce Speaker Distortion by Tuning a Pipe\u003c\/strong\u003e: by Nelson Pass .................................... \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Quadpod C\u003c\/strong\u003e: by E.T. Dell, Jr. and J.I. Goldberg ........................................................ \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Electrostatic Speaker System (Part II)\u003c\/strong\u003e: by David P. Hermeyer ............................. \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuadpod Variations\u003c\/strong\u003e: by Gary Sturm and Arnold S. Berger .......................................... \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHinge Your FM Farm\u003c\/strong\u003e: by Damon Hill ............................................................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Review: The Gately SM-6A Mixer\u003c\/strong\u003e ............................................................................. \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow Electrostics Work\u003c\/strong\u003e .......................................................................................................... \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Taylor, Hazlehurst, and Wiley ..................................... \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Long evening jobs\u003c\/strong\u003e: by James K. Jobson .................................................. \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudio Fundamentals: The Matching Myth\u003c\/strong\u003e: by Reginald Williamson .......................... \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors (Part 7)\u003c\/strong\u003e: by C.N.G. Matthews ......................................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLETTERS\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e27\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJUST LOOKING\u003c\/strong\u003e ..................................................................................................................... \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCLASSIFIED\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328675492054,"sku":"AA-4-1972","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/72_04_c.jpg?v=1780696845"},{"product_id":"audio-amateur-1-1971-pdf","title":"Audio Amateur 1\/1971 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1971 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe first issue of \u003cstrong\u003e1971\u003c\/strong\u003e (Volume II, Number 1) for \u003cem\u003eThe Audio Amateur\u003c\/em\u003e kicks off the magazine's second year with a focus on sophisticated decoding, precision instrument modifications, and the foundational physics of solid-state sound. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe QUADPOD\u003c\/strong\u003e: Recover the hidden ambiance in your stereo recordings! This simple yet effective \"4 x 2\" decoder uses a clever three-transistor-per-channel arrangement to extract four channels of sound from standard sources, bringing the \"three-dimensional miracle\" of the concert hall into your listening room.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Greening of the IG-18\u003c\/strong\u003e: Transform your modest Heath sine\/square generator into a laboratory-grade instrument. This definitive guide shows you how to slash distortion to a staggering 0.003% and achieve professional accuracy for a fraction of the cost of high-end gear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControlling those Volts and Amperes\u003c\/strong\u003e: Achieve the ultimate in stable, clean power. Explore three sophisticated designs for regulated power supplies—including a specialized 60V unit for the Bailey amplifier—ensuring your system performs at its absolute peak.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the heart of modern electronics. This installment dives into the physics of the \u003cstrong\u003ep-n junction\u003c\/strong\u003e, explaining exactly how current flows across semiconductor barriers and why these components are the indispensable \"building blocks\" of audio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat Makes a Recording Valuable?\u003c\/strong\u003e: Take a nostalgic journey through the history of sound. A veteran recordist reflects on the gear and the moments that make a recording truly priceless, from gold-plated button microphones to capturing legendary live performances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: Unlock a treasure trove of DIY ingenuity. From a \"hybrid Dyna\" modification that rivals high-end boutique preamps to professional secrets for applying \u003cstrong\u003edry-transfer lettering\u003c\/strong\u003e to your custom equipment panels, these reader-submitted hacks are essential for any serious builder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Preflight Checkup\u003c\/strong\u003e: Don't let a technical oversight ruin your next session. This comprehensive \"pre-flight\" checklist ensures your tape decks, microphones, and cables are primed and ready for action, so you can focus on the music instead of the hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe QUADPOD\u003c\/strong\u003e: by E. T. Dell, Jr. and J. I. Goldberg .................................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Greening of the IG-18\u003c\/strong\u003e: by Reginald Williamson ................................................ \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControlling those Volts and Amperes\u003c\/strong\u003e: by Paul Greene ............................................ \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors—Part 4\u003c\/strong\u003e: by C. N. G. Matthews ................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat Makes a Recording Valuable?\u003c\/strong\u003e: by Ernie Rawlings ........................................... \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Greisel, Rossmassler, Coggins, and Douglas .......... \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Preflight Checkup\u003c\/strong\u003e: by James K. Jobson ................................................ \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters from readers\u003c\/strong\u003e ........................................................................................................ \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified Ads\u003c\/strong\u003e .................................................................................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking, thanks\u003c\/strong\u003e ........................................................................................................ \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328681095382,"sku":"AA-1-1971","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/71_01_cover.jpg?v=1780697037"},{"product_id":"audio-amateur-2-1971-pdf","title":"Audio Amateur 2\/1971 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1971 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eIssue 2, 1971\u003c\/strong\u003e edition of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e (Volume II, Number 2) marks a significant evolution in DIY audio, featuring sophisticated mixer designs and high-performance preamplifier modifications. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Simple 4+4 Mixer\u003c\/strong\u003e: Build a compact, portable, and versatile active mixer that overcomes the inherent flaws of passive designs. With four inputs per stereo channel and an ingenious \u003cstrong\u003e8-input group fader option\u003c\/strong\u003e, this project delivers professional-grade performance using modern integrated circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 20\/20 Mark II Preamp\u003c\/strong\u003e: Take your signal path to the \"state-of-the-art\" for less than $50. This redesigned, low-profile masterpiece features improved sensitivity, a \u003cstrong\u003egenerous 40dB overload factor\u003c\/strong\u003e, and a built-in rumble filter to tame even the most difficult analog sources.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe QUADPOD B\u003c\/strong\u003e: Experience the \"musical realism\" of four-channel sound for a relatively small investment. This simple encoder lets you \u003cstrong\u003erecord four separate sources into just two tracks\u003c\/strong\u003e, adding stunning depth and concert-hall ambiance to your home recordings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMissing: 15 Seconds of a World Premiere\u003c\/strong\u003e: A cautionary tale of high-stakes recording. Relive the drama of capturing a world premiere choral performance and learn the critical lesson of why \u003cstrong\u003emonitoring your source\u003c\/strong\u003e is the difference between a masterpiece and a missing finale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the physics of the semiconductor diode. 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Master the essential art of editing both before and during your tape sessions to ensure a polished final product.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Simple 4+4 Mixer\u003c\/strong\u003e: by Reginald Williamson ................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMissing: 15 seconds of a world premiere\u003c\/strong\u003e: by Bruce C. Trump .................................... \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe QUADPOD B\u003c\/strong\u003e: by E.T. Dell, Jr. \u0026amp; J.I. Goldberg .......................................................... \u003cstrong\u003e8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 20\/20 Mark II Preamp\u003c\/strong\u003e: by Reginald Williamson ................................................... \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Ornsteen, Sofranko, Gloeckler, and Gilmore ............. \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors, Part 5\u003c\/strong\u003e: by C. N. G. Matthews .......................................... \u003cstrong\u003e19\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Tape Editing\u003c\/strong\u003e: by James K. Jobson ................................................................ \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters from Readers\u003c\/strong\u003e ............................................................................................................ \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking, thanks\u003c\/strong\u003e ............................................................................................................. \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified Ads\u003c\/strong\u003e .......................................................................................................................... \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328685813974,"sku":"AA-2-1971","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/71_02_cover.jpg?v=1780697156"},{"product_id":"audio-amateur-3-1971-pdf","title":"Audio Amateur 3\/1971 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1971 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eIssue 3, 1971\u003c\/strong\u003e edition of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e (Volume II, Number 3) takes you inside the cutting-edge labs of Advent and provides the blueprints for advanced quadraphonic recording. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversation with Henry Kloss\u003c\/strong\u003e: Step inside the mind of an audio legend. In this extensive interview, \u003cstrong\u003eHenry Kloss\u003c\/strong\u003e discusses his \"missionary zeal\" for better ideas, the hidden potential of the cassette, and why he believes \u003cstrong\u003efour-channel sound\u003c\/strong\u003e is the most exciting frontier for the home experimenter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Quadpod D\u003c\/strong\u003e: Capture the \"three-dimensional miracle\" of live music. Build this high-performance \u003cstrong\u003efour-channel microphone preamp and encoder\u003c\/strong\u003e, allowing you to record spatial audio and encode it for playback through standard matrixed systems .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heathkit IM-16 Voltmeter\u003c\/strong\u003e: Is it time to upgrade your workbench? This in-depth evaluation puts Heath’s \u003cstrong\u003esolid-state voltmeter\u003c\/strong\u003e to the test, weighing the benefits of its \"0.5V\" extra sensitivity against the traditional reliability of tube-type meters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-tracking Trains\u003c\/strong\u003e: Join a field recording \"eccentric\" on a mission to preserve the vanishing sounds of \u003cstrong\u003esteam and diesel locomotives\u003c\/strong\u003e. Learn the professional techniques required to capture high-fidelity transients in the challenging outdoors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the \"Diodes in Thousand.\" This technical installment explains the physics of the \u003cstrong\u003ep-n junction\u003c\/strong\u003e and provides the essential theory needed to design stable, noise-free power rectifiers and reference circuits .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Quadraphonic Recording\u003c\/strong\u003e: Bring the concert hall home. James Jobson breaks down three professional methods for \u003cstrong\u003erecording live quadraphonic sound\u003c\/strong\u003e, including how to utilize matrixed encoders for stunning \"surround\" realism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: This issue is packed with DIY ingenuity, featuring a \u003cstrong\u003estepped tone control modification\u003c\/strong\u003e for the Dynaco PAT-4, a professional-grade record cleaning method, and essential stability fixes for AR-3a and AR-2 speakers .\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversation with Henry Kloss\u003c\/strong\u003e: by Staff .......................................................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Four Channel Microphone Preamp\/Encoder\u003c\/strong\u003e: by E. T. Dell \u0026amp; J. I. Goldberg ........... \u003cstrong\u003e8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Heathkit IM-16 Voltmeter\u003c\/strong\u003e ............................................................................. \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-tracking Trains\u003c\/strong\u003e: by E. D. Hoaglan .............................................................................. \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors: Part 6\u003c\/strong\u003e: by C.N.G. Matthews .......................................... \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques: Quadraphonic recording\u003c\/strong\u003e: by James K. Jobson ........................................ \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Relich, Fonte, Tannehill, and Douglas ........................... \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking\u003c\/strong\u003e .......................................................................................................................... \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328691089622,"sku":"AA-3-1971","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/71_03_cover.jpg?v=1780697284"},{"product_id":"audio-amateur-4-1971-pdf","title":"Audio Amateur 4\/1971 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 4\/1971 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe final issue of \u003cstrong\u003e1971\u003c\/strong\u003e (\u003cem\u003eThe Audio Amateur\u003c\/em\u003e, Issue 4) concludes the magazine's second year with a philosophical call to arms for hobbyists and a focus on innovative quadraphonic decoding and antenna engineering. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Manifesto for Audio Amateurs\u003c\/strong\u003e: Stop apologizing for your \"playing\" with audio. The Editor provides a stirring defense of the audio avocation, celebrating the unique \"moment of triumph\" when a project is finished, the switch is flipped, and the test signal finally appears on the scope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Quadpod C\u003c\/strong\u003e: The series on ambient sound concludes with this \"utterly simple\" version. Using a single IC and monophonic power amp, this design allows you to add two back channels of ambient sound to any stereo system for a minimum of effort and cost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuadpod Variations\u003c\/strong\u003e: Discover how fellow builders are pushing the boundaries of quadraphonic sound. This article details reader-submitted modifications, including how to install a Quadpod directly into a \u003cstrong\u003eDynaco PAT-4\u003c\/strong\u003e and an advanced version utilizing \u003cstrong\u003eSanken hybrid power modules\u003c\/strong\u003e for a high-performance rear-channel system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHinge Your FM Farm\u003c\/strong\u003e: Stop risking your life on dangerous ladders to adjust your antenna. Learn how to build a \u003cstrong\u003ehinged mast system\u003c\/strong\u003e that allows you to lower a massive antenna array to the ground for easy maintenance and tuning, ensuring your FM reception is always optimized.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Prokit SM-6A Mixer\u003c\/strong\u003e: Does a $299 DIY kit really belong in a professional studio? Get the definitive bench test results on this six-channel stereo mixer, evaluating its performance, assembly challenges, and its suitability for serious location recording.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: Master the art of the workshop with reader-submitted ingenuity. This installment features a critical \u003cstrong\u003eauto-shutoff modification for the Rabco ST-4 turntable\u003c\/strong\u003e and professional secrets for managing cables during complex on-location recording sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques\u003c\/strong\u003e: Explore the creative potential of your tape deck. James Jobson shares techniques for \"re-recording\" and synthesizing audio, including a fascinating account of how to transform a mono TV broadcast into a rich, stereo-like experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the \"heart\" of solid-state engineering. Part 7 dives deep into the physics of the \u003cstrong\u003etransistor\u003c\/strong\u003e, explaining the mechanics of p-n-p and n-p-n junctions, the critical science of biasing, and the mathematics of gain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Manifesto for Audio Amateurs\u003c\/strong\u003e: by The Editor ................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Quadpod C\u003c\/strong\u003e: by Edward T. Dell \u0026amp; Joshua I. Goldberg ............................................... \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuadpod Variations\u003c\/strong\u003e: by Gary Sturm and Arnold S. Berger ............................................. \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHinge Your FM Farm\u003c\/strong\u003e: by Damon Hill ............................................................................... \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Report: Prokit SM-6A Mixer\u003c\/strong\u003e ........................................................................................ \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Vorhis and Jobson ........................................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques\u003c\/strong\u003e: by James K. Jobson ...................................................................................... \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors, Part 7: The Transistor\u003c\/strong\u003e: by C.N.G. Matthews ............. \u003cstrong\u003e19\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e .................................................................................................................................... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking, thanks\u003c\/strong\u003e .......................................................................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................. \u003cstrong\u003e24\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328698364118,"sku":"AA-4-1971","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/71_04_cover.jpg?v=1780697622"},{"product_id":"audio-amateur-1-1970-pdf","title":"Audio Amateur 1\/1970 - Premiere Issue - PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 1\/1970 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/1970-Issue1-AudioAmateur.png?v=1780697938\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWinter 1970 (\u003cspan style=\"color: rgb(248, 13, 13);\"\u003eVolume 1, Number 1\u003c\/span\u003e)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe debut issue of \u003cem\u003e\u003cstrong\u003eThe Audio Amateur\u003c\/strong\u003e\u003c\/em\u003e marks the beginning of a new era for DIY enthusiasts, focusing on precision solid-state design and the restoration of classic gear. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Twin-twenty, Mark II\u003c\/strong\u003e: Build a sophisticated 20-watt power amplifier utilizing an all-silicon, fully complementary output stage. This design doesn't just deliver high-fidelity sound; it includes a sophisticated \u003cstrong\u003eelectronic overload protection circuit\u003c\/strong\u003e to save your speakers and transistors from accidental damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisc Pollution: How to Fight It\u003c\/strong\u003e: Stop letting \"pops and crackles\" ruin your listening experience. Audio legend Percy Wilson shares a \"systematic approach\" to deep-cleaning factory-sealed records and provides plans for a \u003cstrong\u003eDIY washing machine\u003c\/strong\u003e that pulls grit out of the grooves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImprove your Dyna PAT-4\u003c\/strong\u003e: Transform the best-selling Dynaco preamplifier into a state-of-the-art performer. This definitive guide details how to replace noisy tone controls with precision \u003cstrong\u003eswitched resistors\u003c\/strong\u003e, optimize phono equalization, and add critical shielding to silence hum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecord Your Own Bomb Scare\u003c\/strong\u003e: Experience the thrill of location recording in the first of a new series. Learn how one amateur captured a historic mass in Assisi, Italy, navigating technical limitations and an actual \u003cstrong\u003ebomb threat\u003c\/strong\u003e to preserve a priceless moment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking, Thanks...\u003c\/strong\u003e: Stop the endless search for specialized components. This curated guide connects you with expert merchants who offer everything from \u003cstrong\u003eetched circuit boards\u003c\/strong\u003e for \u003cem\u003eTAA\u003c\/em\u003e projects to matched pairs of high-performance transistors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch4\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Twin-twenty, Mark II\u003c\/strong\u003e: by Reginald Williamson ................................................................ \u003cstrong\u003e2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisc Pollution: How to fight it\u003c\/strong\u003e: by Percy Wilson ................................................................ \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImprove your Dyna PAT-4\u003c\/strong\u003e: by the Editor ................................................................................ \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecord your own bomb scare\u003c\/strong\u003e: by T. C. Whitehouse ........................................................... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust looking, thanks...\u003c\/strong\u003e: by Amateur .......................................................................................... \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ............................................................................................................................................. \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComing Attractions\u003c\/strong\u003e ................................................................................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328711143638,"sku":"AA-1-1970","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/70_01_cover.jpg?v=1780697828"},{"product_id":"audio-amateur-2-1970-pdf","title":"Audio Amateur 2\/1970 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 2\/1970 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eSpring 1970\u003c\/strong\u003e issue (Volume 1, Number 2) of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e continues to push the boundaries of home audio engineering with innovative speaker designs, investigative tours, and essential solid-state theory. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-C\/H-Q, Mark I\u003c\/strong\u003e: Build a low-cost, high-quality bookshelf speaker that punches way above its weight. Utilizing an equalized elliptical transducer and a 10\" baffle, this project delivers a level of clarity and realism usually reserved for much more expensive commercial designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEATH: King Kitmaker\u003c\/strong\u003e: Go behind the scenes at the world's most successful electronics kit empire. This exclusive tour of the Heath plant reveals the \"tough-minded\" engineering and scrupulous testing required to make complex audio gear buildable for everyone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlay them above the dust\u003c\/strong\u003e: Rescue your music from surface noise and static. Learn how a simple modification using \"pips\" to elevate your records can neutralize static charges and significantly reduce the rumble that masks fine musical detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice, Time \u0026amp; Value\u003c\/strong\u003e: Navigate the used audio market like a professional. This comprehensive study tracks eight years of price data for legendary brands like Marantz and McIntosh, showing you exactly where to find the best performance-to-price value in the second-hand market.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Bulk Tape Eraser\u003c\/strong\u003e: Achieve studio-quiet backgrounds on your magnetic recordings. Construct this powerful, inexpensive degausser from surplus TV chokes to completely wipe away cumulative tape hiss and \"extraneous material\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the foundations of the solid-state revolution. This first installment introduces \"Black Box\" theory, providing the essential logic needed to understand how modern transistors actually amplify sound signals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBenchmarks\u003c\/strong\u003e: Elevate your workshop skills to a professional craft. This guide reviews the essential handbooks and manuals every serious audio amateur needs to build a world-class technical library.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-C\/H-Q, Mark I\u003c\/strong\u003e: by Peter J. Baxandall ................................................................ \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHEATH: King Kitmaker\u003c\/strong\u003e: by the Editor ........................................................................ \u003cstrong\u003e9\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlay them above the dust\u003c\/strong\u003e: by Percy Wilson ................................................................ \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice, Time \u0026amp; Value\u003c\/strong\u003e: by Amateur ................................................................................ \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Bulk Tape Eraser\u003c\/strong\u003e: by the Editor ................................................................................ \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: by C. N. G. Matthews ................................................. \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBenchmarks\u003c\/strong\u003e: by Amateur ................................................................................................ \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ............................................................................................................................... \u003cstrong\u003e21\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified Ads\u003c\/strong\u003e ................................................................................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust Looking, thanks\u003c\/strong\u003e ........................................................................................................ \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328721760470,"sku":"AA-2-1970","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/70_02_cover.jpg?v=1780698097"},{"product_id":"audio-amateur-3-1970-pdf","title":"Audio Amateur 3\/1970 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1970 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eSummer 1970\u003c\/strong\u003e issue (Volume 1, Number 3) of \u003cem\u003eThe Audio Amateur\u003c\/em\u003e is a technical tour de force, offering advanced circuit designs and deep dives into the physics of high-fidelity sound. Here are the highlights to entice your inner audio engineer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumbers Game\u003c\/strong\u003e: Cut through the \"wild power claims\" of commercial manufacturers. This investigative piece explores the reality of power ratings, debunking Madison Avenue myths and explaining how to achieve honest, low-distortion watts for real-world listening .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Low Noise Tape Playback Amplifier\u003c\/strong\u003e: Build a professional-grade playback stage for your recording system. This versatile circuit, featured on a compact two-inch plug-in board, is the perfect foundation for building a high-quality tape copier or a four-channel playback deck.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatch Plug Pleasure\u003c\/strong\u003e: End the \"rat’s nest\" of cables behind your equipment once and for all. Learn how to build a flexible, professional-style patch panel that acts as the central nerve center for your entire installation, allowing instant interconnections with zero frustration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtecting Output Transistors\u003c\/strong\u003e: Save your expensive solid-state power devices from their own \"self-destruct tendencies.\" Dr. Arthur Bailey surveys the most effective methods for protecting transistors from overloads and short circuits, ensuring your high-power designs stay safe and reliable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques\u003c\/strong\u003e: Master the art of the microphone. The premiere of this series provides expert techniques for capturing the complex sounds of grand pianos, pipe organs, and choral groups, helping you achieve a truly \"live\" recording with stunning clarity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-C\/H-Q, Mark I\u003c\/strong\u003e: Go inside the lab with legendary designer Peter Baxandall. In this technical installment, follow the precise design and measurement process for a center-channel woofer to complete a high-performance, low-cost loudspeaker system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the atomic foundations of modern audio. This deep dive into electron energy bands and semiconductor physics provides the essential engineering knowledge required to truly understand how transistors work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBenchmarks\u003c\/strong\u003e: Transform your workshop into a precision engineering lab. Get expert advice on selecting the right tools, mastering metalwork, and utilizing the best construction techniques to make your DIY projects look and perform like professional gear .\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumbers Game\u003c\/strong\u003e: by The Editor and Reginald Williamson ......................................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e ................................................................................................................................... \u003cstrong\u003e4\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Low Noise Tape Playback Amplifier\u003c\/strong\u003e: by Reginald Williamson ............................ \u003cstrong\u003e5\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatch Plug Pleasure\u003c\/strong\u003e: by Alan S. Douglas ....................................................................... \u003cstrong\u003e8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethods of Protecting Output Transistors\u003c\/strong\u003e: by Arthur R. Bailey ............................ \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques\u003c\/strong\u003e: by James K. Jobson ...................................................................................... \u003cstrong\u003e13\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-C\/H-Q, Mark I\u003c\/strong\u003e: by Peter J. Baxandall .......................................................................... \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: by C. N. G. Matthews ................................................. \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBenchmarks\u003c\/strong\u003e: by Amateur ................................................................................................ \u003cstrong\u003e19\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Letters\u003c\/strong\u003e ..................................................................................................................... \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified Ads\u003c\/strong\u003e ................................................................................................................... \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust looking, thanks\u003c\/strong\u003e ........................................................................................................ \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328729559254,"sku":"AA-3-1970","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/70_03_cover.jpg?v=1780698251"},{"product_id":"audio-amateur-4-1970-pdf","title":"Audio Amateur 4\/1970 PDF","description":"\u003cp\u003e\u003cstrong\u003eAudio Amateur 3\/1970 PDF -\u003c\/strong\u003e Issue is in black \u0026amp; white\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eScan of printed copy, PDF download immediately upon purchase\u003c\/p\u003e\n\u003cp\u003eThe final issue of \u003cstrong\u003e1970\u003c\/strong\u003e (\u003cem\u003eThe Audio Amateur\u003c\/em\u003e, Issue 4) concludes the magazine's inaugural year with a landmark focus on high-performance amplification and the debut of a modular mixer series. Here are the highlights to entice your inner audio craftsman:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign Decisions toward building Your Own Mixer\u003c\/strong\u003e: Tired of limitations? Start building your own modular audio mixer from scratch . Part I of this series dives into the fundamental logic of mixer design, explaining how to handle input signals, grouping, and the critical role of cable capacitance in maintaining signal integrity .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Bailey 30-30\u003c\/strong\u003e: Discover the secrets behind this \"runaway best-seller\" from England . This 30-watt stereo power amplifier features a fully complementary silicon output and unconditional stability, offering a refined sound that rivals the best tube units without the heat or bulk .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilding a Bailey\u003c\/strong\u003e: Ready to heat up the soldering iron? This comprehensive construction guide provides everything you need to build your own Bailey amplifier, from etching custom circuit boards to selecting matched transistor pairs and managing heat dissipation for maximum reliability .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Dubbing Deck\u003c\/strong\u003e: Don't let your rare recordings gather dust. Learn how to repurpose a vintage tape transport into a high-performance playback deck using simple modifications and specialized preamps, perfect for high-quality tape-to-tape copying .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors\u003c\/strong\u003e: Master the atomic-level science of audio . This installment explores how \"doping\" silicon with aluminum or arsenic creates the holes and free electrons that allow semiconductors to function, providing the foundational knowledge for any serious designer .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePutting a God on Tape\u003c\/strong\u003e: Experience the thrill of capturing nature’s most elusive sounds . Follow one recordist's spine-tingling journey to capture a massive thunderstorm on tape, resulting in a recording of startling dynamic range and \"electrifying\" detail .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques\u003c\/strong\u003e: Join the global community of \"tapespondents\" . This guide explores the \"great pleasures\" of exchanging tapes with fellow enthusiasts around the world and provides the essential rules of etiquette for international tape correspondence .\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: Tap into the workshop wisdom of the \u003cem\u003eTAA\u003c\/em\u003e community . This issue features ingenious hacks for cleaning Janszen electrostatic speakers, professional metalworking tips for crafting custom chassis, and a fix for oxidized power supply terminals .\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign Decisions toward building Your Own Mixer: Part I\u003c\/strong\u003e: by Peter Levesley .................... \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLetters\u003c\/strong\u003e .......................................................................................................................................................... \u003cstrong\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Bailey 30-30\u003c\/strong\u003e: by Arthur R. Bailey ............................................................................................... \u003cstrong\u003e7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilding a Bailey\u003c\/strong\u003e: by TAA Staff .......................................................................................................... \u003cstrong\u003e11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA Dubbing Deck\u003c\/strong\u003e: by Amateur ............................................................................................................ \u003cstrong\u003e14\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLearning to Use Transistors, Part 3\u003c\/strong\u003e: by C. N. G. Matthews ..................................................... \u003cstrong\u003e16\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePutting a God on Tape\u003c\/strong\u003e: by Frank E. Johnson III .......................................................................... \u003cstrong\u003e17\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapeniques\u003c\/strong\u003e: by James K. Jobson ........................................................................................................ \u003cstrong\u003e18\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTips \u0026amp; Technique\u003c\/strong\u003e: by readers Belastock, Greene and Douglas ................................................ \u003cstrong\u003e20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBookshelf: Schematic primer\u003c\/strong\u003e ............................................................................................................. \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJust looking, thanks\u003c\/strong\u003e ............................................................................................................................. \u003cstrong\u003e23\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassified\u003c\/strong\u003e ................................................................................................................................................. \u003cstrong\u003e22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CC-Webshop","offers":[{"title":"Default Title","offer_id":48328738308310,"sku":"AA-4-1970","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/70_04_cover.jpg?v=1780698380"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/collections\/1970-Issue1-AudioAmateur.png?v=1781038547","url":"https:\/\/cc-webshop.com\/collections\/audio-amateur-magazine.oembed?page=2","provider":"CC-Webshop","version":"1.0","type":"link"}