Issue 3 of 1973 (Volume IV, Number 3) for The Audio Amateur is a visual and technical feast, bridging the gap between electronic theory and the physical reality of sound waves. Here are the highlights to entice your inner audio craftsman:
- How to Photograph Sound: Ever wanted to see your music? Discover the fascinating world of sound wave photography. Learn how to build a motor-driven scanning rig that uses a neon bulb to map out sound patterns and diffraction, revealing exactly how your speakers are interacting with your listening room,.
- Electrostatic Amplifier Mark 2: Take your high-end transparency to the next level. David Hermeyer unveils critical modifications to his acclaimed electrostatic amplifier design, slashing distortion through ingenious "common mode" feedback techniques that result in improved resolution and clarity,.
- The Super Brute: Build a 120-watt tube powerhouse that lives up to its name. Based on the legendary Dyna Mark III but featuring a "stiff" military-grade power supply and refined bias circuitry, this beast provides stunning musicality and authoritative control over even the most demanding speakers,,.
- Audio Fundamentals—About Equalization: Why do your records need a specialized "replay curve" to sound right? Reg Williamson demystifies the physics of the vinyl groove, explaining the absolute necessity of RIAA equalization and how to optimize your phono stage for absolute fidelity,.
- Learning to Use Transistors: Master the "common-emitter" amplifier. This practical installment provides a step-by-step working example, showing you how to design stable, high-performance solid-state stages that resist thermal drift and provide reliable gain,.
- Audio Aids & Comfort: Precision signal control doesn't have to be a mystery. Learn how to design and build custom ladder attenuators—including a space-saving "pancake" layout—to achieve professional-grade accuracy and constant impedance in your signal path,.
Table of Contents
- How to Photograph Sound: by Edward H. Parker ................................................................ 2
- Electrostatic Amplifier Mark 2: by David P. Hermeyer ..................................................... 6
- The Super Brute: by L.C. Landers .......................................................................................... 9
- Audio Fundamentals—About Equalization: by Reginald Williamson ............................ 16
- Audio Aids & Comfort: by readers Parsons, Hazlehurst, and Bryant .............................. 18
- Learning to Use Transistors—Part 14: by C.N.G. Matthews ........................................... 22
- LETTERS .................................................................................................................................... 24
- CLASSIFIED .............................................................................................................................. 28
- AD INDEX ................................................................................................................................... 28