eh figured that was plan bGenerally hum is due to a ground loop or on older equipment a bad capacitor some where in the unit. More than likely a recap will fix the problem.
also noticing the scratchiness in the volume knob keeps coming back; respraying the contact cleaner fixed it. Do I need Deoxit or a lubricant as well? (deoxit is like $35 a can here so was putting it off)