{"product_id":"glass-audio-1997-issue-4-of-6","title":"Glass Audio 1997 Issue 4 (of 6)","description":"\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e1997 Issue 4 (of 6) of Glass Audio - in PDF format\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eLink emailed immediately upon purchase\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eExperience the perfect blend of technical measurement and subjective listening with \u003cstrong\u003eVolume 9, Number 4 of \u003cem\u003eGlass Audio\u003c\/em\u003e (1997)\u003c\/strong\u003e. This issue provides a deep dive into the following featured articles and projects:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound of the Machine: The Hidden Harmonics Behind THD\u003c\/strong\u003e – Professional speaker designer Lynn Olson and Matt Kamna of Tektronix use \u003cstrong\u003eelaborate spectrum analysis\u003c\/strong\u003e to reveal why traditional total harmonic distortion (THD) measurements often fail to reflect what we actually hear. Discover how \"hidden\" patterns of even and odd harmonics define the unique sonic signature of various tube circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Performance Tubed DAC Output Stage, Part 2\u003c\/strong\u003e – Jukka Tolonen moves from simulation to practice, delivering a \u003cstrong\u003ecomplete, workable design\u003c\/strong\u003e for a tubed output stage to replace semiconductor stages in existing CD players. This installment includes a \u003cstrong\u003eprinted circuit board layout\u003c\/strong\u003e, regulated power supplies, and construction details for a smooth-sounding amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSPICE and the Art of Preamp Design, Part 2\u003c\/strong\u003e – Norman Koren concludes his study on using \u003cstrong\u003ecomputer modeling\u003c\/strong\u003e to demystify high-end design. This part focuses on line-amplifier versions, exploring the pros and cons of tone controls and demonstrating how SPICE can achieve \u003cstrong\u003enearly perfect frequency response\u003c\/strong\u003e while taming RF interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA WWII “VT”\/Generic Conversion Tube Chart\u003c\/strong\u003e – Decipher the military’s secret codes with Frederick Seitz's \u003cstrong\u003eessential conversion chart\u003c\/strong\u003e. Whether you've found \"gold\" at a garage sale or have a stash of vintage surplus, this guide links military \"VT\" numbers to their usable modern equivalents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuest Editorial: The Impedance Wars\u003c\/strong\u003e – André Jute explores the \"bitter battle\" over load impedance and the \u003cstrong\u003econtroversy surrounding tapped output transformers\u003c\/strong\u003e. He urges designers to look past established dogmas and keep an open mind to achieve better sound quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlass Shard: Ye Olde Test Mule\u003c\/strong\u003e – Stop letting your spare parts gather dust! Chris Wolf provides a guide for building a permanent \u003cstrong\u003etube-type test mule\u003c\/strong\u003e, turning your collection of extras into a versatile bench tool for testing new circuits without the need for constant fabbing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCONTENTS\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eVolume 9 Number 4 (1997)\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth align=\"left\"\u003eArticle\u003c\/th\u003e\n\u003cth align=\"left\"\u003eAuthor(s)\u003c\/th\u003e\n\u003cth align=\"left\"\u003ePage\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eSound of the Machine: The Hidden Harmonics Behind THD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eLynn Olson and Matt Kamna\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eHigh-Performance Tubed DAC Output Stage, Part 2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eJukka Tolonen\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e26\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eSPICE and the Art of Preamp Design, Part 2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eNorman Koren\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e38\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eA WWII “VT”\/Generic Conversion Tube Chart\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eFrederick J. Seitz\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e52\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eGlass Case\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e—\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eGuest Editorial: The Impedance Wars\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eAndré Jute\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eLetters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e—\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e57\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eClassifieds\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e—\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eAd Index\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e—\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eGlass Shard: Ye Olde Test Mule\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eChris Wolf\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e69\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eNote: Page numbers are based on the table of contents provided in the source.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"audioXpress","offers":[{"title":"Default Title","offer_id":48377500795094,"sku":"AA-GA97-4PDF","price":6.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0021\/5013\/7974\/files\/GA-1997-Issue4-infographic..png?v=1783548696","url":"https:\/\/cc-webshop.com\/products\/glass-audio-1997-issue-4-of-6","provider":"CC-Webshop","version":"1.0","type":"link"}