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miguelnoda 17th February 2013 03:15 PM

preamplifier usher p 307a
Hi I have a preamp would usher p 307th and adjust the voltages Someone will have the service manual or reference of all voltages.gracias

jlithen 30th September 2014 11:47 AM

Maybe a bit late reply, but they seem to be +/-20V and +/-12V.
The voltages are just regulated in two stages of LM317 and 337 I think.

I just bought one and have built a custom PSU for it and I will do a recap.
Original caps are absolute crap.

Maybe replacing the regulators might be beneficial too :)

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