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Old 4th February 2013, 11:12 PM   #71
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It appears to be a diode for the relay... guess I should replace it. Perry this wouldn't cause DC to go to the output terminal right? Possibly part of the cause of the excessive current though? I've pulled a few of the outputs but they are all ok. Think I'm going to pull them all and check every one.
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Old 5th February 2013, 01:44 AM   #72
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In the circuit, you're reading the relay coil.

If the diode was shorted or leaking badly, it would cause the relay driver to fail. Since the relay is engaging, that circuit would appear to be OK.
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Old 5th February 2013, 11:32 PM   #73
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After lifting it, you were right it was fine.

SO! After going to remove the output transistors, I found that broken legs are a LOT HARDER to notice than I thought. It turns out I had broken legs on 4 of the outputs. The desoldering pump sucked them right into it, lol.

Also L7815 has a broken leg, plus that broken master/slave rca...

Looks like I have some work to do.... I'm going to remove all the rest of the transistors and check them all. None of the outputs where shorted or leaky.

Last edited by Deadly Sones; 5th February 2013 at 11:47 PM.
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Old 9th February 2013, 09:20 PM   #74
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Where might I be able to buy some of this type of sil pad? This stuff is pretty thick (.015"). Or can I just use Kapton tape?
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Old 9th February 2013, 09:38 PM   #75
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If it's being used between the transistors and the heatsink, you can use Kapton.
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Old 9th February 2013, 09:48 PM   #76
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Yes it is, K thanks. The Kapton is really thin compared to this stuff, so thought I should ask.
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Old 10th February 2013, 12:03 AM   #77
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If the heatsink is rough or has any burrs on it, you will need to smooth it out if you use the 1mil kapton tape.
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Old 15th February 2013, 04:57 PM   #78
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I cleaned it up well.

Just wanted to update and say that after replacing the whole one side (2 banks) of output transistors (cause 5 of the 8 had broken legs), replaced the 7815, and rebuilt the broken legs on the master/slave rca. This amps good as new.

Only 0.003vdc on outputs now (was over 60), and is only pulling 3.7a of current @ idle with no limiter.

Thanks again Perry!

The one transformer (that feeds the 15v supply) is still ringing... is there something I can do to quiet it up? It changes pitch when I twist it. Or should I just leave well enough alone?

Last edited by Deadly Sones; 15th February 2013 at 05:05 PM.
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Old 15th February 2013, 05:08 PM   #79
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You can twist it, then apply silicone or epoxy. Whatever you apply make sure it is completely dry before re-powering the amp.
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Old 15th February 2013, 05:12 PM   #80
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Well I CAN twist it, but it does resist twisting. Its not loose by any-means. There is silicone around all of them already. It barely moves as a twist but doing so does change the pitch, if I let go, it comes back
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