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Check the power supply area for bad connections especially near the large capacitors. If one or more of those are disconnected, the DC voltage will have some noisy AC on it that will sound like a buzz.
I would try using an electronic cleaner on the pot(s) to see if that helps. Many times either the surface of the coil, the wiper, or both become contaminated with excessive residue and fail as you describe. Shaking it or moving it quickly sometimes removes enough of the contamination for it to temporarily function again. But if you clean all of the gunk off, it will work like new. Try this inexpensive Radio Shack product. If it doesn't fix the problem, you'll need to replace the pot.
Hope this helps. If it does, please rate as "FixYa".
Unless there is a 240/120 switch on the back, this amplifier cannot change voltage. The only way is to replace the power transformer, and when you do that you need to use the exact model transformer Peavey uses for the 120 version. I have also seen differences in handling power outside of just a different transformer for USA/Euro models.
The differences between these two market models might be beyond what is cost-effective to convert.
Electronics get things called dry joints, this is where the soldered components become insulated from their surrounding components intermittently. This usually manifests itself some years in use.
The symptoms are just like you describe the system cuts in and out.
I have repaired heaps of these over the years and it takes patience with a magnifying glass and a hot soldering iron to repair..
Id start with the socket connections on the main circuit board where you push cables in and them pulll them out again...as thats where mechanical pressure is
placed onto the conection between the socket and the circuit board.
What type of noise is it making? If it sounds like a load hum, you may have a 60 cycle hum issue. This is caused by a capacitor not filtering out the 60 cycle ripple on the DC voltage supplied by the power supply. If you have this problem I would suggest measuring the power supply with a DC voltmeter first and writing this measurement down. Then I would suggest you plugging the amp into an isolation transformer and taking an oscilloscope (plugged into the wall)and measuring the DC voltage while the oscilloscope is set to AC if you see an AC ripple voltage higher then .1mv you have a bad filter capacitor or a bad voltage regulator.
Your problem sounds very similar to mine. I have a Marshal that does the same thing. It gets power but either no sound comes out or it's fragmented and buzzing. I took the circuit board out and found that a fuse had pulled/been knocked loose and was hanging free. If you take your amp apart, make sure you unplug it first. You're going to be be looking for something that look likes a small lego that suspended above the circuit board by wires coming out of both ends. If ones of these wires has pulled free then that's your problem. You can temporarily fix it by pressing the wire back into the circuit board and placing electrical tape over the top of the fuse to hold it all in place. If you do this, however, you can't play loud or it will rattle loose again and you don't really get more than about 10 minutes of play time. I'm about to solder mine whenever the guns arrives, so I'll let you know if this is a DIY project or not.