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Question edited for clarity, full 'make model (what it is)'.
Question moved to make / model category.
It sounds like a power board or overheating issue. Find your local Peavey agent and take it in for repair. If you want to try something, open it up and look for a cooling fan and fluffed up vents.
Not sure about the KB-1, but many newer Peavey amps
( A Vyper for example)
have the fuse soldered to the circuit board.
If you're going to go through the effort of soldering, I'd suggest buying, and soldering in, a rear panel accessible fuse holder, so you only need to do it once.
If no fuses blown you probably have an issue on your +15V and -15V power supply regulators, this can be tested by checking opamps supply voltage which should be +15V at pin-8 and -15V at pin-4, let me know further.
You have a bad power circuit board. if you are tech-inclined,you can open the mixer's rear cover and check for bulging/leaking capacitors on the board. they will need to be replaced. Or just order a new PCB from Peavey. Rodger, in tech support, will be happy to help.
Use the series light bulb trick when trying to first power this up. Use a 150 watt bulb in series with the 120 volt power to avoid damage and blown fuses.
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