Audio Research SP-3A1
Little is documented about the Audio Research SP-3A1. Period print also shows it as "SP-3A-1" and "SP3A-1". It turns up in the record as a name more than a fully documented product. Audio's October 1975 issue included the SP-3A-1 in its preamplifier section (Audio, October 1975, p.44). A classified listing in the same magazine (February 1977, p.95) offered a used SP3A-1 preamp at $500, paired with an Audio Research D-150 power amplifier at $2,300.
Beyond those two appearances, almost nothing is recorded. No full specification sheet, original price, production years or measured review data have surfaced in the available documentation. All that is confirmed is that this was an Audio Research preamplifier on the mid-1970s market. It is an obscure model in the company's early lineup.
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