ARC SP-3A1
The Archive's holdings say very little about the ARC SP-3A1. Audio (October 1975, p.44) included it in its preamplifier section, which confirms the SP-3A1 was a preamp from Audio Research. No specifications, production years, original price or circuit details survive in the sources we have.
The SP-3A1 does turn up in period classifieds a few years later. Audio (August 1981, p.73) ran a listing for an "ARC SP3A1" at $475, offered alongside an SP6A preamp and D76A amplifier. Another ad in the same issue lists an "ARC/Van Alstine SP-3A-1" at $450. The Van Alstine name suggests modified examples were in circulation, but what the modification was isn't documented.
Known facts:
- Preamplifier, as listed in Audio's preamp section (October 1975, p.44)
- Seen on the used market around $450 - $475 by August 1981 (Audio, August 1981, p.73)
- No other specs, dates, or history are currently documented
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