Audio Research D-75A
Very little is documented about the Audio Research D-75A. The model name appears in none of the period sources in the Archive's files. There is no review, no advertisement, and no mention in the classified columns that periodically listed Audio Research gear. The closest record is a classified ad in Audio (June 1981, p.87) offering other Audio Research models for sale: a D-100A at $625, a D52B at $795, and a D-110B. The D-75A itself never shows up.
No identity information, specifications, design details, production years, or prices have been verified. Nobody has confirmed whether the D-75A was a power amplifier, a preamplifier, or something else entirely. It may have been a short-run model, a dealer-ordered variant, or a designation that appeared in early literature and vanished, as a few other Audio Research models seem to have. An owner's manual, schematic, or period review would settle it.
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