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Old 3rd October 2012, 11:13 AM   #31
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Completely disconnect the amp from everything. Find the terminals for each of the rail caps. Determine which is positive and which is negative for each rail cap. Connect your 12v power supply across each rail cap. Make sure that you have the proper polarity. Do this with a current limiter or a 3-5 amp fuse in the power line. Does the amp continuously draw more than a fraction of an amp when you touch the 12v power supply to the caps?

To clarify... Nothing will be connected to the amp except the +/- of the 12v supply to the individual rail caps, one at a time.
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Old 3rd October 2012, 02:35 PM   #32
Nite is offline Nite  Europe
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Connected 12v power supply across each of the four rail caps, but there isn't significant current draw. They are not shorted. I have another amp for parts with a working PS, but blown audio section. Would it be possible to use its power supply and connect it to the audio section of the amp we are discussing here to see if the audio section powers up or will the protection cuircuit disable it?
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Old 3rd October 2012, 02:45 PM   #33
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Could the current draw be affected by the fact that I don't have some small transistors installed in one channel?
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Old 5th October 2012, 02:03 AM   #34
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That's unlikely unless the output transistors are FETs but they would have to be in the circuit and unless I'm mistaken, you stated that the outputs were out of the amp.

Connect it to the power supply through a current limiting resistor, clamp all power transistors to the heatsink and see what gets hot.
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