Bass Amp

Caps and rectifier diodes now replaced but no difference, still loud hum/buzz so where to go from here ?
I would have given you less than one chance in four that this would happen, assuming the new parts are installed correctly.

Does the pilot light still extinguish quickly?

Save the old (apparently working) parts as spares. Check them if you get the chance, you can never have enough info in a case like this.

Now you need an oscilloscope and schematic.

Might still be a missing ground/shield connection somewhere.

Knowing what we all knew about this symptom I think we all acted reasonably. Sometimes that's not enough. :(

BTW, http://fullnet.com/~tomg/esrscope.htm
 
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