I have a Rowe R-88 jukebox. There is a hum that increases with the volume increase. Note this short Youtube vid:
I've replaced the capacitors in the amp and the capacitors for the speakers. I've tested the power supply capacitors and they are good. I did notice that the power supply had been rewired at some point. The hum is still there.
So I started to disconnect everything in an effort to locate a grounding issue. Then I unplugged everything from the power supply. With the power supply turned on and with everything unplugged from the power supply to the jukebox components, there is a quite hum coming from the speakers?
Any ideas? Does anyone have the wiring diagram for the power supply. I can't think of anything else.