Check the reverb tank for bad or loose connections. Also check for cold or bad solder connections
Dusty pots get proper spray cleaner to clean the control pots, move them back and forth after you spray and noise should clear up. have a good one.
Just a long shot, but remove the pedal that turns on the reverb and trem, I've had that cop out on me loads of times and that can cause a horrible hum.
SOURCE: just got my fender 63 reverb reissue unit...and
If you unplug the guitar cable and STILL get the hum, the unit has a defect... return under warranty.
If the hum goes away when you unplug the cable, replace the cable and see if new cable fixes the problem. If it does, the cable has a bad shield.
If the cable didn't cure it, then the guitar has a defect. Remember that some guitar pickups are sensitive to the magnetic fields from the amps... only cure is to either use humbucker types or be a distance away from the amp.
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