Re: Frying amplifier finals... audio, not rf...
i often help a guy fixing amps - dont get them myself.
the most common cause of final destruction is faulty bits in the pre-drive either overdriving the finals or turning both parts of a push/pull pair on together or overlapped!
it can be anything - last one was just an out-of-value resistor shifting the bias enough to make one transistor drive against the other!!!
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