Does the hum change at all by turning any of the controls? If you look at the speakers when you turn on the amp, do the cones move in or out and stay there?
Yes, there is a schematic for your amp in the technical section.
stevem Messages: 4733 Registered: June 2004 Location: NY
Senior Member
If your trouble shooting skills include having a voltmeter and knowing how to use it the set it for DC volts and hook it up across the unplugged in end of the speaker cable with the amp turned on, take note of that voltage measurement and report back to us.