Most of the time amplifier hum is caused by the outlet that it's plugged into, maybe no ground or there's other appliances on the same circuit causing interference? And sometimes it's as simple as a little internal feedback, certain C notes on the Guitar cause distortion with tube amps, the best fix is a $100 power conditioner like made by Monster cables or others.... hope this helps?
You have a bad ground probably inside the amp , you need a on hands Tec for this one. I bet its not to serious , about $65.00, is it worth it to ya all tho I don't know your area , but its been my exp.this would be a fair price most any where. good luck DFD
SOURCE: circuit diagram for a Peavey 130 special
Try http://www.peavey.com/support/contactinfo/ You may be able to get one from them. When I was doing repairs they would only release schematics to Peavey dealers but you can always ask.
Here is a link to the manual for this unit, it shows a few settings and explains the controls for you pretty well, like this "transtube" feature. You will never get the sound of those you listen to on albums or radio unless you use a lot of expensive equipment but you can get a pretty good imitation of it if you get the hang of the controls.
http://www.peavey.com/assets/literature/manuals/80301112.pdf
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