Amp troubleshooting problems

[GSS]

I have a 65watt Fender Frontman that I was runing my Les Paul through. I was playing with my delay and I had the feedback up fairly high when I saw smoke come out of pre out and a low hum is all I can get out of the amp. I opened it up and replaced R76 which was scorched, but I still have the same result, no change. I do not know where my schematic is therefore I don't know what any of the measurements are suposed to be. I have not done any troubleshooting in some years although I did a lot in lab in school, and I was an audeo engineer for over twenty years, but I am stuck at where to start. Any advise or similar experiance would be great to have. I can't see where it would contribute to this problem, but I had just lined the entire cavity of my Strat with copper foil to rid it of noise pryor to this happening, but I was not playing it at the time, and I can see no reason that it could cause a problem. I honestly think that the high regineration rate of the delay just overpwoered the amp and burned some componants. I am just unsure where to start.
Thanks,
Greg

[Enzo]

Nothing you fed the input jack hurt the amp.. If the signal was too hot for the input, all it would do would be to clip. Like yelling into a microphone won;t hurt the mixer. Oh maybe an analog meter could have it's needle bend.

Chances are the power amp failed. Is there DC on the speaker? DOn;t leave DC on the speaker for more than a brief moment, it will melt the voice coil.


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