Audio Amateur 3/1978 PDF
Audio Amateur 3/1978 PDF - Issue is in black & white
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The 1978 issue 3 of The Audio Amateur delivers a fascinating mix of legendary interviews, precision engineering, and groundbreaking psychoacoustic theory. Here are the highlights to entice your inner audiophile:
- Showcase: We Visit Peter Walker and Quad: Take an exclusive trip to Huntington, England, for a deep-dive interview with the founder of Quad. Peter Walker discusses the future of electrostatic loudspeakers, the goals of "documentary" sound reproduction, and why he remains skeptical of four-channel audio.
- The Little Big Horn: Build a small, highly efficient folded horn loudspeaker 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.
- An Audio Activated Power Switch: Simplify your system with this clever device that automatically switches on your power amplifiers when it detects an audio signal and shuts them down after the music stops—an ideal solution for hidden or remote equipment.
- More Facts of Life on Sound Source Localization: Explore the "shadowy area" of how our brains perceive the shape and depth of sound. Dennis Bayzer provides provocative observations on perceived sound localization that challenge traditional stereo reproduction concepts.
- Noise Control in IC Op Amps for Audio: Master the science of silent circuits with Walt Jung. This technical guide explains how to design for the lowest possible noise using integrated circuits, covering everything from thermal noise to input-referred noise voltage.
- Kit Report: The Hafler DH-101: Is David Hafler’s low-priced newcomer truly a "state-of-the-art" contender? Walt Jung and David Vorhis provide a rigorous bench test and subjective evaluation of this high-performance preamplifier.
- Component Interfaces: Universal Pickup Arms: Optimize your vinyl playback. B.J. Webb continues his essential series, providing professional advice on correctly mounting and setting up universal pickup arms for maximum fidelity.
- Audio Aids: This issue is packed with DIY brilliance, including reader-submitted techniques for measuring crossover coil values, tips for gluing electrostatic panels, and instructions for creating a storage 'scope substitute.
- Classic Circuitry: The Childs 50W Amplifier: Reference the engineering of a vintage legend. This issue features the complete schematic for the Ulric J. Childs 50W Class A power amplifier, courtesy of Jack Hannold.
Table of Contents
- We Visit Peter Walker and Quad: by the Editor ................................................................ 4
- The Little Big Horn: by C.R.B. Lister ................................................................................... 12
- An Audio Activated Power Switch: by Jan Didden ........................................................... 16
- More Facts of Life on Sound Source Localization: by Dennis Bayzer ........................... 22
- Noise Control in IC Op Amps for Audio: by Walt Jung ................................................... 27
- Kit Report: The Hafler DH-101: by Walt Jung & David Vorhis ........................................ 33
- Component Interfaces: Part III: by B.J. Webb ................................................................... 42
- Audio Aids: by readers Tooley, Smith, Carlstrom and Muller ......................................... 44
- Classic Circuitry: The Childs 50W Amplifier ........................................................................ 47
- LETTERS ................................................................................................................................... 48
- CORRECTIONS .......................................................................................................................... 48
- CLASSIFIED ................................................................................................................................ 58
- ADVERTISING INDEX ........................................................................................................... 62