Audio Amateur 4/1978 PDF

Audio Amateur 4/1978 PDF - Issue is in black & white
Scan of printed copy, PDF download immediately upon purchase

The 1978 issue 4 of The Audio Amateur 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:

• The Pass A-40 Power Amplifier: Build a masterpiece of "pure Class A power" from the legendary Nelson Pass. 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.
• A Thermal Primer: Stop guessing about cooling. James Boak provides the essential "how-to" on calculating thermal resistance and heat sink requirements to ensure your high-power solid-state projects stay cool and reliable under pressure.
• A Direct Reading Capacitance Meter: Every serious builder needs a way to verify components. This versatile project allows you to accurately measure a capacitor's value and condition, including internal leakage resistance, using a clever triangle-wave generator.
• Coincident Microphone Technique: Learn the secrets of "cleaner imaging" from professional recording engineer Brian Preston. Discover how crossing two cardioid microphones can capture a live performance with stunning depth and perspective without the phase issues of multi-miking.
• Component Interfaces: Stylii, Dirt, and Grooves: In his final article for the magazine, the late B.J. Webb delivers a definitive guide to disc maintenance. From fighting static to evaluating cleaning machines, learn the best methods to keep your vinyl software pristine.
• Kit Reports: Dynaco and Pink Noise: Get the expert verdict on the Dynaco SE-10 10-octave equalizer and the West Side Electronics Pink Noise Generator, a sophisticated tool for room and speaker analysis using digital pseudo-random noise.
• Audio Aids: A treasure trove of reader-submitted ingenuity, featuring an "Isolationist Stand" for turntables, a precision VTVM improvement, and technical tips for optimizing transmission line speaker pipes.
• Classic Circuitry: Study the engineering of a vintage pioneer. This issue features the full schematic for Fairchild’s Electronic Turntable, a 1957 classic featuring a synchronous motor powered by a push-pull amplifier.
• Showcase: Russell D. Williams: Explore a high-performance, craftsman-built system featuring tri-amped transmission lines and custom-built Class A power based on Nelson Pass’s designs.

Table of Contents

• The Pass A-40 Power Amplifier: by Nelson Pass ................................................................ 4
• A Thermal Primer: by James Boak ....................................................................................... 13
• A Direct Reading Capacitance Meter: by Richard Schroeder .......................................... 16
• Coincident Microphone Technique: by Brian Preston ..................................................... 24
• Component Interfaces: stylii, dirt, grooves: by B. J. Webb ................................................ 28
• Kit Reports ................................................................................................................................ 32
  • Dynaco SE-10 by David Vorhis
  • West Side Electronics Pink Noise Generator by Frederick M. Gloeckler, Jr.
• Audio Aids: by readers Squires, Merrick, Carlstrom & Muller, Henneberg and Saunders ............................................................................................................................................ 40
• Classic Circuitry: Fairchild's Electronic Turntable ............................................................. 42
• Showcase: Russell D. Williams' craftsman's system ............................................................ 46
• LETTERS .................................................................................................................................... 47
• CLASSIFIED .............................................................................................................................. 56
• ADVERTISER INDEX ............................................................................................................. 62