DOD R-831 (advertised 1985)

Not much information on the DOD R-831 survives, and almost all of it is DOD's own advertising from early 1985. The ads pushed the unit, usually labelled the R-831B, alongside the R-830B. The pitch was that low price no longer had to mean low quality. DOD claimed computer-aided design, low noise, high slew rate, low distortion, and precise controls for both models. It also called them among the most popular equalizers on the market at the time.

A representative ad in Studio Sound (January 1985, p.35) credited the R-831 with modular PC-board construction, an all-metal chassis, a bypass switch, center-detented linear potentiometers, 12 dB of boost or cut, a low-cut filter, four-level LED output indicators, signal-to-noise better than 95 dB, and IM distortion below 0.01%. No independent review has turned up in the available sources, so these are manufacturer claims, not measured results. Production dates and original price are not documented.

Similar items on eBay

No exact DOD R-831 listings are live right now — these searches show current DOD and similar vintage synth gear on eBay:

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.

Related Models

• DOD R-830
• Carver MXR-2000 (1983)
• A-Designs HM2EQ
• A-Designs KGB-II
• A-Designs KGB-ITF
• Accuphase DG-28
• Accuphase G-18
• Altec 802-8E (1960s–1970s)
• Altec 804A
• Altec M-500 (1955)