Amplifier hum - normal?

Hmm... I think it's a bit over my head. I've never made a circuit... but, I suppose this may be a good place to start.

Do you have a friend or relative with good basic electrical knowledge to whom you can turn for help ? If you are unsure of your skills, then don't attempt this. Also, the cans of the capacitors are going to be at line potential. They have plastic shrink labeling around them but there is still some bare metal exposed. You need to exercise care that these don't come into contact with anything else. Observe polarity of the caps and diodes. The caps usually have a (-) marking on the side with the negative lead to indicate polarity. The diodes have a band on one side to indicate the cathode (negative) side.

See this circuit:
img.villagephotos.com/p/2003-5...

The only 1000V diode is 1N4007. 1N4001 is only 50V

I do have a relative that is good with soldering and circuits. I'll see if he's up for a project - could be fun.

The PS Audio Humbuster III worked pretty well for me. Give it a try, most places carry a 30 day money back guarantee. Not much risk.