ARC D-90
Almost nothing is documented about the ARC D-90. What little survives comes from classified ads in Audio magazine between 1982 and 1984, where the D-90 is listed among other Audio Research Corporation equipment. A December 1983 ad offered the D-90 as "new" at $1,195 (Audio, December 1983, p.111). A September 1982 listing put it at $1,385 (Audio, September 1982, p.72). An October 1982 ad quoted $1,395 (Audio, October 1982, p.115).
No specifications, design details, production years or original documentation have been located. The D-90 shows up in these ads alongside models like the D-110, D-150 and D-350. That suggests a power amplifier in ARC's solid-state lineup, but it's inference, not fact. "D-90" might denote a 90-watt-per-channel rating, going by the naming convention of other ARC D-series amps. That is unconfirmed.
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