Audio Amateur 3/1979 PDF

Audio Amateur 3/1979 PDF - Issue is in black & white
Scan of printed copy, PDF download immediately upon purchase

1979 issue 3 of Audio Amateur 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:

• Showcase: The Vacuum Turntable: Discover Robert L. Doughty’s innovative DIY turntable that uses a vacuum system to hold records "rock solid" against a glass platter. It’s a precision-engineered solution designed to eliminate warp, wow, and flutter for pristine playback.
• A Vacuum Tube, Variable Frequency Crossover: Bi-amplification enthusiasts can build Brian Waldron's continuously variable, 18dB/octave Butterworth crossover. Using classic 12AX7 tubes, this project offers a detailed, warm signal path with switch-selectable ranges from 20Hz to 20kHz.
• The "Compex" Noise Reduction System: Reg Williamson introduces a professional-grade compandor (compressor/expander) for the home recordist. Leveraging the versatile Signetics 570 chip, this low-cost noise reduction project is designed to significantly clean up tape hiss and expand your system's dynamic range.
• The PAT-5/WJ-1A: A Definitive Update: Audio legends Walt Jung and Dave White return with a massive update to their famous Dynaco PAT-5 modification. Learn how DC coupling and FET inputs can strip away "masking effects" to reveal a level of sonic clarity that rivals high-end "state-of-the-art" gear.
• Holes, Hardware and Hearing: Dive into the fascinating world of psychoacoustics with Rod Rees and Ron Shaffer. This article explores how our perceptual mindset and auditory space perception are just as critical as our hardware in achieving a truly realistic "spatial" listening experience.
• The Grounded Ear: In his debut column, Peter Sutheim provides an expert's perspective on the latest industry trends and technical seminars. This issue covers everything from innovative ribbon transducer designs to new methodologies in loudspeaker measurement.
• Classic Circuitry: The Dynaco PAS-2: Tube enthusiasts will appreciate this detailed look at a vintage legend. This section provides the complete schematic and technical specifications for the venerable Dynaco PAS-2 preamplifier.

Table of Contents

• Showcase: Robert L. Doughty ...................................................................................................... 2
• Editorials ........................................................................................................................................... 4
• A Vacuum Tube, Variable Frequency Crossover: by Brian Waldron .................................... 6
• Noise Reduction Systems and One for Amateurs: by Reg Williamson .............................. 12
• The PAT-5/WJ-1A: A PAT-5 WJ-1 Update: by Walt Jung and Dave White .......................... 24
• Holes, Hardware and Hearing: by Rod Rees and Ron Shaffer ............................................. 36
• Audio Aids: by readers Banks, Branam and Boutin ................................................................ 40
• Book Reviews: by Ron Miller ........................................................................................................ 44
• Recordings Review: by editors Gloeckler and Williamson ..................................................... 49
• The Grounded Ear: by Peter Sutheim ........................................................................................ 54
• Classic Circuitry: The Dynaco PAS-2 preamp ........................................................................... 56
• CORRECTIONS ................................................................................................................................ 57
• LETTERS ............................................................................................................................................. 57
• CLASSIFIED ........................................................................................................................................ 65
• AD INDEX .......................................................................................................................................... 70