I was amazed to discover that I have never uploaded the manual for the Presto 92A Amplifier. It also includes the schematic for the Presto 92B amplifier.
If I am understanding Alan Graves correctly, the chief difference in the two amps was that the 92B had automatic EQ circuitry (for increasing the treble towards the center on 33.3 rpm recording) integrated directly into the amp, instead of as a separately sold accessory.
My 92A actually has certain capacitors and other modifications that are only found in the 92B schematic. Apparently Presto had a habit of changing their designs and not updating the schematics....so in spite of certain similarities to the 92B, mine is actually a 92A.
Presto 92A Amp Manual and Schematic
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Presto 92A Amp Manual and Schematic
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