Audio Amateur 4/1979 PDF

Audio Amateur 4/1979 PDF - Issue is in black & white
Scan of printed copy, PDF download immediately upon purchase

1979 issue 4 of The Audio Amateur 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:

• Showcase: Audio Craftsmanship: 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.
• The Williamson 40/40 Power Amplifier: 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.
• Conversations with Peter Baxandall: 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.
• The Saga of Golden Ear vs. Meter Reader: 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 really hear versus what the meters say.
• A Precision LED Power Meter: 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.
• Audio Aids: This issue features a treasure trove of technical tips, including a DIY 3dB ladder network, instructions for leveling an SME 3009 III headshell, and a guide to understanding and using Zener diodes in your power supplies.
• Kit Report: The Integrex Dolby Noise Reducer: 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.
• Test Report: The Jung-White PAT-5/WJ-1A: 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.
• The Grounded Ear: Peter Sutheim explores the sonic impact of dbx noise reduction on vinyl records and discusses the nuances of professional microphones and on-location recording.
• Classic Circuitry: The Audio Research SP-6: 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.

Table of Contents

• Showcase: Randy Vikan ........................................................................................................ 2
• Editorials .................................................................................................................................... 4
• The Williamson 40/40 Power Amplifier: by Reg Williamson ....................................... 5
• Conversations with Peter Baxandall; Part I ..................................................................... 12
• The Saga of Golden Ear and Meter Reader: by Rod Rees and Ron Shaffer ............. 20
• A Power Meter: by Duncan W. MacArthur ....................................................................... 23
• Audio Aids: by readers Davis, Brush, Clark, and Carlstrom .......................................... 40
• Kit Report: The Integrex Dolby® Noise Reducer: by Fred M. Gloeckler, Jr. ........... 44
• Test Report: The Jung-White PAT-5/WJ-1A: by David Vorhis ..................................... 48
• The Grounded Ear: by Peter Sutheim ................................................................................ 54
• Classic Circuitry: The Audio Research SP-6 preamp ..................................................... 54
• CORRECTIONS ......................................................................................................................... 55
• LETTERS ..................................................................................................................................... 55
• CLASSIFIED ................................................................................................................................ 65
• AD INDEX ................................................................................................................................... 70