Redstone Electronics is a custom electronics design, construction and modification service focused on high end audio. We design & build new equipment and modify older high end equipment for both reliability reasons and for improved sonics.
This webpage documents some of my work and contains reference materials for those technically inclined.
CAOW1 New 9/2009
Mini-monitor, designed by Dennis Murphy, built as floorstanding version. Uses the Hiquphon OW1 tweeter and Seas CA15RLY woofer in a vented enclosure.
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.
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.
Reference materials, including plans and crossover schematic, on this dual transmission line woofer.
Digital Audio (USB DACs)
Day-Sequerra Tuners - reference information Updated 9-2012
Amplifiers, Preamps and Crossover
Updated 10/08 with Bill Johnson mod suggestions
Reel to Reel
Misc Scans of Interesting Audio Materials
New 9/2012: Amplifier Test Clinic brochures (both from mid-late 1970s):
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.
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.