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Old 8th January 2013, 02:55 AM   #21
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I meant 2SA1275 & 2SC3228. Sorry.
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Old 8th January 2013, 03:27 AM   #22
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They are probably the driver transistors. They act as a buffer between the driver board and the FETs.
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Old 30th January 2013, 11:42 PM   #23
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Hello Perry. I'm back. Here's an update. First, I fixed the problem with the amp only pulling .204 volts from the power supply. The solder pads on the driver transistors(2SA1275 & 2SC3228) were burnt pretty bad so I used a jumper wire to connect them. I discovered that I had the jumper wire in the wrong place. Once I corrected that problem, the amp powered up just fine and the relay did engage. Now, I replaced all the output transistors(IRF640N & IRF9640) and re-installed all the power FETS(IRFP064N) and the amp powers up just with no FETS overheating or failing like in the beginning. The problem I have now is when I connect a speaker to it, I only get a feedback\humming noise and that's with and without a signal through the audio input. I have positive & negative rail voltage(+/-24Volts) across the dual rectifiers and output transistors(IRF640N & IRF9640). Your assistance is greatly appreciated. Thanks.
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Old 31st January 2013, 12:48 AM   #24
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Do any of the controls on the amp make any difference in the hum?

Are you saying that absolutely nothing was connected to the RCA jacks?
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Old 31st January 2013, 12:59 AM   #25
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Hi Perry. When I increase the volume knob, you can hear the change of pitch if that makes any sense. And Yes, that's with and without anything connected to the RCA jacks. I actually have it powered up in front of me right now.
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Old 31st January 2013, 01:05 AM   #26
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Can you make the hum change if you push on the various pots?

Does it produce audio?

Don't check for audio unless you clamp the FETs.
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Old 31st January 2013, 01:10 AM   #27
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I have to admit Perry that I do not have any of FET's or output transistors clamped. These black clips are not that easy to take on & off all the time so I thought I could get away with testing for audio for a few seconds without them. I guess not. My bad.
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Old 31st January 2013, 01:13 AM   #28
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The clamps are only to reduce the chance of destroying the FETs. They should not affect the hum.

If you haven't seen THIS, it may help with the clamps.
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Old 31st January 2013, 01:22 AM   #29
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Cool. Thanks Perry. I'll pop the clamps back on and continue testing. Give me a few minutes and I'll see if the humming changes when I push certain pots.
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Old 31st January 2013, 02:03 AM   #30
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Ok Perry. I popped the clamps back on. I powered up the amp and I get still get the humming noise, so I decided to run a signal through it with my iphone on HBO and you hear the audio but it isn't clean. When I turn the volume up, you can hear the audio increase but it isn't clean at all. It almost sounds as if someone is underwater.
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