Hi. Lately it seems all my equipment is giving me greef… My PS Audio GCPH has developed a peculiar problem: if I don’t use it for a few days, left channel dies, but only on RCA output; on XLR output it works, but not as loud as it should be; right channel has nearly zero DC on output (0.1mv), and it does not change when I turn volume knob all the way up; left has about 1.3mv, and it goes higher and begins to cycle between about -6 to +6mv on full output. I wonder if it’s a simple re-cap job, or is the output chip kaput? I managed to find a reverse-engineered schematic online.
Thx
Thx
Can you post the schematic here, or if not email it to me?
Sounds like one phase of the left channel is out.
That would cause a 6dB loss at the XLR output, and
would be the positive phase output to kill the RCA output.
Sounds like one phase of the left channel is out.
That would cause a 6dB loss at the XLR output, and
would be the positive phase output to kill the RCA output.
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That’s what I thought. But why would it come back and work fine if I leave it on? It almost seems like there’s a cap leaking somewhere. I’m posting a picture with plastic covers removed from the gain cells. There are three electrolytics in each.
Attachments
Left channel comes back after a few hrs of I leave it on, and keeps working, even after I turned it off for a few hrs. Weird. Seems like a leaking cap somewhere?
Could be an electrolytic (not so likely), or more likely just a bad solder connection.
Those can be difficult to find with SMT.
The schematic will help to narrow things down. Can you take some closer, very sharp photos?
Those can be difficult to find with SMT.
The schematic will help to narrow things down. Can you take some closer, very sharp photos?
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I will. The pictures I posted are not from mine, I didn’t open mine yet. Just getting over a “pi…d-off” period )))