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Im not sure if you said that you guitar was un pluged from the amplfier or not.If your using a guitar with single coil pickups the are really bad about hum.If you already tried that then check your cables and maybe move your amp to a diffrent outlet.When preamp tubes go band they usally go out which would cause a decrease in sound or hum.Does the hum get worse if you turn the gain up or master volume up with the guitar unpluged?I try that.
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