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I build and modify audio equipment. This webpage documents some of my work and contains reference materials for those technically inclined.
The sections below are as follows (projects listed chronologically in each section):
1. Speakers
2. Digital Audio (USB DACs)
3. Tuners
4. Amps, Preamps & Crossovers
5. Reel to Reel
6. Phono Systems
7. Misc, inc Scans of Interesting Audio Materials
1. Speakers
1. Speakers
Jeff Bagby's quasi-transient-perfect 3 way design using Satori and SB Acoustics drivers.
This is an extension of a 2019 project to build the woofer section of the KEF 104 by adding the tweeter and crossover to complete the 104aB speaker.
LS3/5a Project involved building this vintage speaker using all new components from Stirling Broadcast and Falcon Acoustics, including new Falcon-made drivers. Includes lots of crossover examination/tweaking measurements.
Jeff Bagby designed mini-monitor to continue the tradition of the famous BBC designed LS3/5a.
Magnepan's top of the line speaker from the late 1980s, with all new drivers and some parts upgrades.
Frequency response measurements of RS Minimus 7, ADC 404, Fried B2, JR149 and LS3/5a speakers.
Mini-monitor, designed by Dennis Murphy, built as floorstanding version. Uses the Hiquphon OW1 tweeter and Seas CA15RLY woofer in a vented enclosure.
Reference materials, including plans and crossover schematic, on this dual transmission line woofer.
This mini-monitor speaker was an evolution of the satellite of the Model H, and competed with the Rogers LS3/5a and JR 149 among others. With the Model T subwoofer (below), it formed the Model H/2 system. Lots of reference material here.
This landmark 3 way speaker system designed by Irving Fried in 1978 consists of two small satellites plus a large common dual channel transmission line subwoofer, using classic KEF drivers.
2. Digital Audio (USB DACs)
2. Digital Audio (USB DACs)
3. Tuners
3. Tuners
Note this tuner is for sale, follow the link i...
4. Amplifiers, Preamps and Crossover
4. Amplifiers, Preamps and Crossover
5. Reel to Reel
5. Reel to Reel
6. Phono Systems
6. Phono Systems
7. Misc., Including Scans of Interesting Audio Materials
7. Misc., Including Scans of Interesting Audio Materials
New 5/2015:
Keith Johnson article: 4 Track Stereo Matchbook Size, Radio-Electronics, July 1960
New 9/2012: Amplifier Test Clinic brochures (both from mid-late 1970s):
Marantz Audio Analysis Program (amp clinic) brochure
McIntosh Amplifier Test Clinic brochure
Technics RS-1500 Reel to Reel Recorder review from Audio magazine, May 1977. Note this is a PDF file.
Above: Ad for Technics RS-1506 from Audio January 1979. Click to enlarge.
20000 Watt Home Hi-Fi System article from Audio magazine, April 1976. This is also a PDF file. The cover of that magazine is shown below.
Cover photo (in color) from the above Audio, April 1976.
Levinson JC-2 Preamp review from Audio magazine, April 1976. Also a PDF file.
Hewlett Packard 339A Distortion Analyzer review from Audio magazine, July, 1979. PDF file.
RIMO FM Tuner Filters article by Richard Modafferi from Audio magazine, January 1979. PDF file.
Kill FM Interference With Two Antennas article by Richard Modafferi, Audio magazine, January 1980. PDF file.
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