One thing is the replacement of the fire prone carbon emitter resistors to a non flamable type.
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If the emitter resistors are "flaming", the amp has a LOT more problems to worry about than just a few smoked resistors. That's because those resistors will only "flame" when the transistors are damaged / on their last leg. As such, you can replace the resistors if / when you have to replace the transistors. Granted, this is a problem that should have been addressed with the original design, but at the same time, it will only happen under specific "high stress" situations. Sean