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CES 1970

Above: Receivers from CES 70. More scenes from 1970 ...

New! We're adding articles, ads and more from classic USA print magazine, High Fidelity.

above: Sony magazine ad from Sept. 1975. Read and see more ...

Electronics Today (UK print magazine)

Radio-Electronics--Special Projects (USA print magazine)

Audio humor

Lirpa -- One-Brand Systems (April Fools humor, Apr. 1983) (for years, Audio magazine featured "Lirpa" April Fools humor in their April issue. Lirpa is April spelled backwards)

above: Weird "audio art" from the 1970s, as used in the long-out-of-print U.S.-based Audio magazine ... read more.

Below: Some classic hi-fi cartoons by Charles Rodrigues (September 29, 1926 - June 14, 2004) -- a contributor to Stereo Review (and other magazines)


"Gammelectronics.com" is now Gammelectronics.xyz -- please update your links accordingly ... thx!

Stereophonic Sound (1957) by Norman H. Crowhurst

Principles of optical storage-–part 2 --Focus and tracking mechanisms

above: Technics SP-10MK3 Turntable (see: Audio mag. review, Feb. 1985)

above: Ad for Audio-Technica AT25 stereo phono cartridge (May 1979)

above: Decca London International Mk VI Gold Elliptical Phono Cartridge (Audio magazine review, Aug. 1979)

above: Shure V15 Type IV ad in Audio magazine, May 1978.

top: Classic Dual turntable review in Audio magazine (Feb. 1977).
above: Advertisement for a Dual 1249 turntable, Audio magazine (May 1977).

above: Portion of Dual turntable ad from April 1978.

above: Photo from an ad of the Dual 731Q turntable, ca. March 1980.

above: Scanning Beam Microscope photo of Stereohedron stylus; 2000 times magnification. Brackets point out wider contact area. Photo featured in this 1979 Stanton Magnetic ad.

above: Pickering XSV 3000 --- vintage 1977 Audio magazine review !

above: Classic Kenwood ad from 1977. Article coming soon!

above: 1979 advertisement for ADCOM Crosscoil.

above: Can you guess what this might be? (answer: eliptical vs. Shibata)

Guide to Recording Music on Location

Articles and ADs from: Electronic Technician/Dealer (classic USA print magazine)

Articles and ADs from: Electronics World (USA print magazine)

Below: Classic ad from audio magazines ca. mid 1970...like this image from a BIC turntable ad ...

Below: Micro-Seiki goodness...

...from Micro-Seiki to Micro-Acoustics ...

Below: An image of a classic turntable for which we have re-published the Audio magazine test report...


Do-it-Yourself (DIY) Electronics -- modification and review pages...

Articles / Guides:

Home Theater and Video

Headphone gear


Phono (turntable, cartridge, vinyl, record care)

Vacuum tubes (valves) and related equipment

Solid state (transistor)

Radio, TV, wireless, broadcasting

Music and Recordings

Harman Kardon turntable series (1983-84 catalog)

"PEAR PRESSURE" (an essay about psychoacoustics...)

Vacuum Tube (Valve) Radio and Audio Repair Guide

Book Review: Mastering Audio by Bob Katz

Balanced Audio Cable Hum: Cause and Cure

Rehabilitating Cathode Followers

Renovating the H.H. Scott 222C vacuum tube integrated amplifier

A Bolt from the Blue: Lightning strikes vs. Home electronics

Japanese IC Preamp with Electronic Level and Selector

High-End 120W MOSFET IC Driven Amp

Switchable Gain Booster Amplifier

The GAMP: Adaptable Power for Tube Amps

Tri-Way Low Voltage Supply

A Chip-Driven SE Monoblock Amplifier

Jadis JS1 Symmetrical D/A processor & J1 Drive CD transport

Audio Alchemy ACD-Pro, Audio Electronic CD-1, and Rotel RCD-990 CD players

The Parts Connection Assemblage DAC-2 D/A converter

Counterpoint DA-10 digital processor

Parasound D/AC-1100 and D/AC-2000 Ultra Digital Processors

Audio Note Kassai Silver Power Amplifier

DSD and SACD -- Evolutionary or Revolutionary?

Carver SD/A-390t CD Changer

Optocouplers for Audio

ezDAC -- A high-performance DIY digital-to-analog processor


Audio (American hi-fi magazine (1947-2000))

Stereo Review (American hi-fi audio magazine, published 1958-1999)

Hot Tip!!! DIY audio (RCA/phono) interconnects

What to use:

WIRE: I use JSC Wire--Multi-Conductor Overall Foil Shield 75°C, 300 V, PE Insulation (the version shown here is more than two conductors)...

...which I get at the local electronics-parts store. It's good enough for most industrial and residential applications and far from being cheap-grade. I also use Canare microphone or coaxial cable; I don't think this more-expensive, audio-app-specific wire is better than JSC.

PHONO (RCA) CONNECTORS: Neutrik, Switchcraft, Canare, etc.

OTHER: Heatshink tubing; high-quality (silver) solder

How to wire: Blue is signal - tip on plug; Screen (shield) is return (ground) - outer on plug. So, how about white? Wire it to the outer at the signal (source) end only, making the cable "directional".

References: audioasylum thread

Shown below: inexpensive but effective Switchcraft 3502 RCA plug...

More-expensive Mogami (cable) and Canare (plug) options ...

Passive Preamp: Transformer Implemented

DIY Noise Meter Amp project

Single-Ended to Differential-Mode Vacuum Tube Projects Made Easy

High-Voltage Differential Amplifier for Measurement

ADCOM GFP-565 Preamp mod

Rebuild a Classic Heath’s W-5M

Sonic Comparison of Power Amplifier Output vs. Input

InterSil D2Audio Class D Audio Modules

The Silent Information Revolution -- Online education challenges traditional paradigms

Gamma: A 10-Watt Integrated Amplifier

Tweaking the Passive Inverse RIAA Network

Calibration of the Hickok 539C tube tester

Cascoding National’s LM12 for 140W

Optimum Stages for Minimal Distortion

JVC HA-D990 headphones--review and analysis

Reliable Audio Engineering via Grounding and System Interlacing

Review of Parasound’s Zamp V3

How Loud Is Real? Why loudness controls never worked

Radio Shack Sound Level Meter Characteristics

An IM Signal Generator Upgrade

An Analog A/B/I Switcher + Headphone Amp

Capacitor Bypassing in Audio Power Supply Circuits: Proceed Carefully!

Review of Echo Busters Decorative Acoustical Treatments

Speech Intelligibility: What reverb is -- and how to calculate it

Review of the Pioneer X-Z9 Compact Stereo System

21st-Century Cinema Design--Viewing and listening requirements for a THX-quality theater design.

MECHANICS HALL -- Meeting house for Music

DIY DAP—A Do-It-Yourself Digital Audio Player: Build an embedded hardware/software system for 16-bit digital audio.

The Willowhill Pre-amp -- A high slew-rate JFET pre-amplifier

Rebuild an Old Turntable -- A simple circuit and some tinkering allow clean analog sound.

All About Speaker Cones -- Let's examine loudspeaker materials, fabrication, and quality

The Basics of Headphone Testing and Measurements

Ultra Low-Noise Phono Preamp [theory, concept, design and DIY project]

Chassis construction techniques for audio projects

Maintaining Your Balance -- A DIY project to handle balanced/unbalanced devices

An Inductively-Equalized Solid-State Phono Preamp

A Minimalist Audio Amplifier Design

The G40EP: A Flea-Powered Headphone Amp (and how to improve this classic design)

The Noise (Analysis) Machine -- a method to perform accurate noise measurements

Distortion Meter – An Audio Interconnect Tester?

Salvaging vintage audio (electronics) treasures -- from dumpsters, eBay, etc.

Sharp MD-D10 Portable MiniDisc Player [review]

Benchmark DAC1 USB [review]

Teac V8000S Cassette Deck [review]

Audio Engineering Guide: Playback of Analog (vinyl) Records

Sound Ecology: environmental and health factors affecting your hi-fi equipment, your listening, and the planet

Audiophile or Audiophool?

Low-Level Analog Effects Switching project (for electric guitars)

Inouye Synergistic Power Line Conditioner

CD player round-up (early 1989): A subjective review -- players—from Magnavox, Adcom, Yamaha, and Onkyo—are in four different price ranges.

Back to the Future: High-rez digital ideas circa 1998

Understanding Tube Electronics (adapted from New York Audio Labs 1984 booklet, by Harvey Rosenberg): The State of Audio Technology; Tubes Versus Transistors -- Is There an Audible Difference?; A Vacuum Tube Audio Primer

Why Power Tubes (valves) Arc

The Cathode Follower and Its Weaker Siblings (Test results confirm that cathode followers are even more capable of driving capacitive loads than equivalent common-cathode amplifiers.)

Decca Stereo and the Los Angeles Philharmonic (1960s and 1970s sound engineering)

Jon Dahlquist on Loudspeaker Design: Of Speaker Design, Theory and the Recorded Truth

In Search of a Reference Phono Cartridge (circa late 1980’s)

The Cartridge Chronicles: Part II [two fixed-coil pickups—of the moving-magnet variety—and a single moving-coil]

A Unique Loudspeaker Crossover Design with Waveform Fidelity

The Place where Tone Begins: 1996 Interview with Mesa Engineering’s Randall Smith

The Audio Bookshelf (missing some titles on your Kindle or bookshelf? read more ...)

CD (optical disc) longevity -- How durable and reliable are they? (read more...)

Old / vintage gear reviews -- WHY they are important

QUESTION: Why resurrect old equipment reviews?

ONE SIMPLE ANSWER: To keep the industry in check.

Old-is-new trends are common in all eras, gadget genres, and formats.

Gear "collectors" may be motivated by nostalgia or boredom or re-sale value (eBay stores)... but let's set these excuses aside, and simply ask this fundamental question:

How much technical progress has really been made in audio science and engineering -- that is, does modern equipment really sound better?

Is there such a thing as "timeless high-fidelity?" Perhaps, yes, if one is talking about: vinyl on classic Thorens turntables, played on decades-old electrostatic and horn loudspeakers, and (of course) through vintage vacuum-tube gear. This old stuff, when functioning properly and reliably (and maybe restored), can directly compete with many contemporary models.

Much old gear can be found on eBay and Craig’s List for considerably less money than band new (or even used-but-modern equipment, as in the overpriced used/2nd hand/trade-in section of hi-fi shops).

Knowing when to invest in old gear takes practice and skill (sometimes literally: as in using a soldering iron!). But the economic and self-accomplishment rewards are well worth it! You many never buy new gear again!

Guide to Audio Engineering

Power Supply Design


Electrodynamic / Orthodynamic: (aka planar magnetic, like Audeze brand)

This type of headphone is essentially in the same family as the moving-coil type, except that the coil has, in effect, been unwound and fixed to a thin, light, plastics diaphragm.

The annular magnetic gap has been replaced by opposing bar magnets, which cause the magnetic field to be squashed more or less parallel to the diaphragm. The " coil " is in fact now a thin conductor zig-zagging or spiraling its way across the surface of the diaphragm, oriented at right angles to the magnetic field so that sending a constant direct current through the conductor results in a more or less equal unidirectional force, which displaces the diaphragm from its rest position. An alternating music signal therefore causes the diaphragm to vibrate in sympathy with it, creating a sound-wave analogue of the music. (read more...)

Guide to Good Sound

Audio Equipment--Troubleshooting and Repair Guide

Guide to Troubleshooting Consumer Electronics Audio Circuits

Guide to Troubleshooting / Repairing Electronics Without a Schematic

General guide to Audio Electronics

Links and references for audio / video and related electronics:

Here are some other sites that contain products or information that may be of interest:

United States Construction Resources and Support— Specializing in indoor and outdoor home lighting, light fixtures, ceiling fans, lamps, and electrical lighting accessories.

"The Construction Resources Folks" -- Home Repair, Improvement and Hardware: Products and Tips for Do-it-Yourself Projects

Industrial Electronics — Electrical Resources for Manufacturing and Government Applications: including Cable & Wire Managers and Cord Covers.

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Updated: Monday, 2020-11-30 10:14 PST

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