Not sure what exactly what the preamp model this is, but this is an early OSA (Old School Audio) preamp back when they were making API 312 preamps. This one uses a Huntington-era API 2520 and a Jensen JE-115-E input transformer. Good cosmetic condition, the face plate screen printing isn't the best but everything is tested and works as it should. Payment with PayPal, shipping in the continental US.
$350 shipped in the continental U.S.
FS: OSA 500 Preamp API 2520 Huntington/Jensen Transformer
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FS: OSA 500 Preamp API 2520 Huntington/Jensen Transformer
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