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Old 15th November 2012, 02:23 PM   #31
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
Testing as was suggested (without rail voltage) will tell you if the drive circuit is OK.

It's VERY odd that you have only 1 of the two paired FETs getting hot if the drive circuit is good. Either install two new FETs or move 504 and 505 to 506 and 507. Does the FET in the same location get hot?

It's also possible that one of the inductors is shorted. Do you see any signs of overheating on the output filter inductor?
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Old 15th November 2012, 11:29 PM   #32
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Join Date: Jun 2012
Location: Huntsville, Alabama
Thanks Perry, I will go back in and perform the test again without the rail voltage (only applying remote power for a second or two and then scoping the gates of the output drivers). I will also move the transistors around and see if the problem follows the same transistor or just the location in the board. I will admit after last nights long battle with this amp, it feels like that point in a relationship where me and this amp may just need a few days apart, LOL. I have a couple more amps coming in for repairs and I will pick up a few more of these output transistors and the resistors when i order parts for the other amps so I can pull out the temporary pots.
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