Audio Amateur 1/1977 PDF

Audio Amateur 1/1977 PDF - Issue is in black & white
Scan of printed copy, PDF download immediately upon purchase

The 1977 issue 1 of The Audio Amateur kicks off the year with a deep dive into advanced distortion analysis and creative DIY enclosure designs. Here are the highlights of this issue:

• Slewing Induced Distortion (SID) in Audio Amplifiers: Audio legend Walt Jung begins a major new series exploring the correlation between measured distortion and what we actually hear. This first installment focuses on the critical, often-overlooked role of slew rate limiting in IC op amps and how it impacts sonic quality.
• The Folded-and-Stapled Bass Horn: Neil Davis presents a unique, low-cost solution for high-quality bass. Using epoxy-stiffened art board, you can build a high-performance, non-resonant horn enclosure for as little as $45 that produces stunningly realistic low-end response.
• Ambience, Blumlein, and the Super Quadpod: Reg Williamson revisits the groundbreaking "Middle-Side" recording techniques of Alan Blumlein. Build the "Super Quadpod" to extract natural ambience from your records, providing a natural-sounding stereo or quadraphonic listening experience.
• Experiments with the Not-Quite-Passive Radiator: Discover a fascinating acoustic phenomenon discovered by H.L. Eisenson. Learn how a simple "trap" circuit can turn an unconnected driver into a highly effective passive radiator, allowing for deep bass response from surprisingly small enclosures.
• Recording Studios by Amateurs: Brent Gabrielsen profiles three home-grown recording studios that prove professional results don't require a professional budget. From custom-built consoles to innovative use of everyday materials, see how amateurs are building their own high-fidelity recording environments.
• Kit Reports: Get the expert verdict on the Heathkit Electronics Fundamentals Course, a comprehensive learning tool for any aspiring audio engineer, and the Proto Board Model 102, a must-have tool for rapid circuit prototyping.
• Nostalgia: How to Buy a Gramophone: Celebrate the 100th anniversary of the phonograph with a guide to vintage audio. B. Clements-Henry provides essential tips on selecting and maintaining a classic "talking machine" that still delivers refined tone.
• Classic Circuitry: The Marantz Model 9: Study the engineering of a tube masterpiece. This issue features the complete, detailed schematic for the legendary Marantz Model 9 Power Amplifier for your reference or restoration projects.
• Showcase: Peer into the listening room of Kermit E. Johnson and explore his professional-grade system, which is largely derived from the high-performance projects featured in The Audio Amateur.
• Tape Recorder Set-up: Howard A. Roberson offers essential supplemental tips on optimizing your tape deck. Learn the nuances of head alignment and tracking to ensure your recordings achieve maximum clarity and fidelity.

Table of Contents

• Slewing Induced Distortion in Audio Amplifiers: Part 1: by Walt Jung ....................... 4
• The folded-and-stapled bass horn: by Neil Davis ........................................................... 10
• Ambience, Blumlein, and the Super Quadpod: by Reg Williamson ............................ 14
• Experiments with the not-quite-passive radiator: by H.L. Eisenson .......................... 18
• Recording Studios by amateurs: by Brent Gabrielsen ................................................. 21
• Kit Reports ............................................................................................................................. 26
  • Heathkit's Electronics Fundamentals Course by R.H. Miller
  • Proto Board Model 102 by James Thoroman
• Audio Aids: by readers Bley, Carlstrom, Bostic, Schaffer and Gilmore ....................... 34
• How to buy a gramophone: by B. Clements-Henry ........................................................ 40
• Classic Circuitry: Marantz Model 9 Power Amplifier ........................................................ 44
• Showcase: Kermit E. Johnson's mostly TAA derived system ........................................... 46
• More Thoughts on Tape Recorder set-up: by Howard A. Roberson ............................. 53
• LETTERS ................................................................................................................................. 47
• CLASSIFIED ............................................................................................................................. 58
• JUST LOOKING ..................................................................................................................... 57
• CORRECTIONS ..................................................................................................................... 47
• AD INDEX ............................................................................................................................... 17