Hello all.
I need some help fixing this amp, I'm at the limits of my knowledge. The amp developed a hum a while back so I decided to change out the electrolytic caps which seemed to be a known issue. That worked well, got rid of the hum, but I now have popping/crackling when the amp board powers on, with no signal input to the amp.
I've checked for bad solder joints and fixed those I thought were suspect, pulled and tested the transistors from the AC-Shift board, pulled resistors where needed to test those in circuit better, measured other things everywhere that I could and cannot fix this thing.
I'm not sure where to go from here. Any thoughts would be much appreciated. I posted the schematics for this amp a few days ago.
Thanks,
Bruce Morton
I need some help fixing this amp, I'm at the limits of my knowledge. The amp developed a hum a while back so I decided to change out the electrolytic caps which seemed to be a known issue. That worked well, got rid of the hum, but I now have popping/crackling when the amp board powers on, with no signal input to the amp.
I've checked for bad solder joints and fixed those I thought were suspect, pulled and tested the transistors from the AC-Shift board, pulled resistors where needed to test those in circuit better, measured other things everywhere that I could and cannot fix this thing.
I'm not sure where to go from here. Any thoughts would be much appreciated. I posted the schematics for this amp a few days ago.
Thanks,
Bruce Morton
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