Audio Amateur 2/1971 PDF

Audio Amateur 2/1971 PDF - Issue is in black & white
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The Issue 2, 1971 edition of The Audio Amateur (Volume II, Number 2) marks a significant evolution in DIY audio, featuring sophisticated mixer designs and high-performance preamplifier modifications. Here are the highlights to entice your inner audio engineer:

• The Simple 4+4 Mixer: Build a compact, portable, and versatile active mixer that overcomes the inherent flaws of passive designs. With four inputs per stereo channel and an ingenious 8-input group fader option, this project delivers professional-grade performance using modern integrated circuits.
• The 20/20 Mark II Preamp: Take your signal path to the "state-of-the-art" for less than $50. This redesigned, low-profile masterpiece features improved sensitivity, a generous 40dB overload factor, and a built-in rumble filter to tame even the most difficult analog sources.
• The QUADPOD B: Experience the "musical realism" of four-channel sound for a relatively small investment. This simple encoder lets you record four separate sources into just two tracks, adding stunning depth and concert-hall ambiance to your home recordings.
• Missing: 15 Seconds of a World Premiere: A cautionary tale of high-stakes recording. Relive the drama of capturing a world premiere choral performance and learn the critical lesson of why monitoring your source is the difference between a masterpiece and a missing finale.
• Learning to Use Transistors: Master the physics of the semiconductor diode. This installment explains the p-n junction, forward and reverse bias, and how to use Zener diodes as precision voltage references in your custom audio circuits.
• Tips & Technique: Discover a goldmine of DIY ingenuity, including how to craft professional-looking engraved panels, a clever tape monitor switching system to expand your setup, and a specialized bass boost modification for the Dynaco PAT-4.
• Tapeniques: Tape Editing: Transform your recordings from "raw" to "radio-ready". Master the essential art of editing both before and during your tape sessions to ensure a polished final product.

Table of Contents

• The Simple 4+4 Mixer: by Reginald Williamson ................................................................ 3
• Missing: 15 seconds of a world premiere: by Bruce C. Trump .................................... 7
• The QUADPOD B: by E.T. Dell, Jr. & J.I. Goldberg .......................................................... 8
• The 20/20 Mark II Preamp: by Reginald Williamson ................................................... 11
• Tips & Technique: by readers Ornsteen, Sofranko, Gloeckler, and Gilmore ............. 16
• Learning to Use Transistors, Part 5: by C. N. G. Matthews .......................................... 19
• Tapeniques: Tape Editing: by James K. Jobson ................................................................ 21
• Letters from Readers ............................................................................................................ 22
• Just Looking, thanks ............................................................................................................. 23
• Classified Ads .......................................................................................................................... 24