Diagnostics for hum


My Celeste HT-3 amp has recently developed a hum in both the left and right channels. What are some basic (non repair shop) diagnostics I can do to help find the problem. I have removed the preamp, and the hum is still there with just the speakers.
bones45

Showing 1 response by gbart

Sounds like possibly a bad cap in common power supply. Not something playing around with lifting ground, etc. is going to solve.