Audio Amateur 4/1972 PDF
Audio Amateur 4/1972 PDF - Issue is in black & white
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The final issue of 1972 (The Audio Amateur, Issue 4) is a technical powerhouse that concludes the magazine's second year with a heavy focus on high-power amplification, precision microphone theory, and radical speaker tuning.
- The Listening Machines: Embark on a comprehensive journey into microphone technology. This definitive guide covers everything from Bell’s earliest 1876 transducers to the sophisticated physics of ribbon, condenser, and dynamic microphones.
- Reduce Speaker Distortion by Tuning a Pipe: Stop settling for "muddy" bass. Audio innovator Nelson Pass demonstrates how tuning a bass-reflex enclosure to a specific "pipe" length can significantly lower harmonic distortion—sometimes by as much as 1% at high power levels.
- An Electrostatic Speaker System (Part II): Build the "ultimate" amplifier for your electrostatic panels. David Hermeyer unveils a massive, 105-pound, direct-coupled Class A tube amplifier utilizing high-voltage transmitting tubes to achieve stunning transparency without the need for output transformers.
- Audio Fundamentals: The Matching Myth: Master the "thorny subject" of impedance. Reginald Williamson debunks common misconceptions about impedance matching in audio systems, teaching you how to properly load your sources for the most accurate signal transfer.
- Learning to Use Transistors: Deepen your engineering foundation with a focus on Small Signal Amplifiers. This installment explores the physics of input characteristics and load lines to help you design stable, distortion-free solid-state stages.
- Tips & Technique: Discover essential workshop wisdom, including a critical study on how speaker fuses impact your amplifier's damping factor and a clever microswitch modification to add auto-shutoff to the Rabco ST-4 turntable.
- A Manifesto for Audio Amateurs: Revisit the philosophical core of the hobby with this declaration of independence for the audio avocation, emphasizing the value of DIY craftsmanship over commercial mass-production.
Table of Contents
- A Manifesto for Audio Amateurs ..................................................................................... 3
- The Listening Machines: Part I: by Richard A. Honeycutt ........................................ 3
- Reduce Speaker Distortion by Tuning a Pipe: by Nelson Pass .................................... 6
- The Quadpod C: by E.T. Dell, Jr. and J.I. Goldberg ........................................................ 7
- An Electrostatic Speaker System (Part II): by David P. Hermeyer ............................. 9
- Quadpod Variations: by Gary Sturm and Arnold S. Berger .......................................... 9
- Hinge Your FM Farm: by Damon Hill ............................................................................... 12
- Kit Review: The Gately SM-6A Mixer ............................................................................. 14
- How Electrostics Work .......................................................................................................... 14
- Tips & Technique: by readers Taylor, Hazlehurst, and Wiley ..................................... 17
- Tapeniques: Long evening jobs: by James K. Jobson .................................................. 18
- Audio Fundamentals: The Matching Myth: by Reginald Williamson .......................... 20
- Learning to Use Transistors (Part 7): by C.N.G. Matthews ......................................... 24
- LETTERS ................................................................................................................................. 27
- JUST LOOKING ..................................................................................................................... 30
- CLASSIFIED ............................................................................................................................. 30