Audio Innovations P2 phono preamp schematic needed

Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

A good friend of mine has owned this preamp for many years without a single problem until now. He's getting limited gain in the right channel and the left channel seems fine. I tested all of the tubes and they all still test nearly 98% of NOS values. As the tube sockets are mounted to a printed circuit board, it's not quite as easy to trace the circuit had it been point to point construction. I searched like crazy, found the recommended tweaks ,as in removing the OA2 regulator tubes, etc., but I'd still like to see a full schematic of the circuit, especially the power supply. I can see that R 31 and R 32 resistors have seen a bit too much heat as they have discolored the circuit board. Any help will be greatly appreciated. Thanks, Paul

http://www.audionote.co.uk/articles/tweak_ai_p2_phono_mod_01 (Open in New Window)

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Topic - Audio Innovations P2 phono preamp schematic needed - wpod 15:29:36 07/25/13 (1)

RE: Audio Innovations P2 phono preamp schematic needed - copydex 13:56:49 07/28/13 (0)

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