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preamplifier usher p 307a
preamplifier usher p 307a
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Old 17th February 2013, 03:15 PM   #1
miguelnoda is offline miguelnoda  Spain
diyAudio Member
Join Date: Oct 2009
Default 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
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Old 30th September 2014, 11:47 AM   #2
jlithen is offline jlithen  Finland
diyAudio Member
Join Date: Nov 2009
Location: Vaasa
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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