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The schematic I grabbed from blueguitar.org shows several fuses in the power supplies. Did you check those, especially the one for the high voltage supply for the output tubes - fuse F1 on 'main board' ?
Or the DC voltage in your amps power supply is not filtering the power after it rectifies the AC power .A really big capacitor across the dc voltage output from the rectifier should filter any AC out.
https://www.allaboutcircuits.com/textbook/experiments/chpt-5/rectifier-filter-circuit/
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.
Check speaker impedance or disconnect speaker leads, then use a 9V battery to verify cone movement and if this test is ok, then go inside the amp, if there's no fuses blown check opamps supply voltage which should be -15V at pin-4 and +15V at pin-8, let me know your results to help improvement.
This is a common issue with peavey mixers and generally speaking could be addressed by checking the opamps supply voltage which should be -15V at pin-4 and +15V at pin-8, this should help to troubleshoot the issue, let me know to help improvement.
It sounds like the power supply is overheating, or an interconnect is becoming loose due to excess heat. This might be due to a faulty heat sensor, but counter-intuitively could also be due to a low voltage supply, that is, drawing more power than the circuit can handle so the voltage drops. Please check that the outlet(s) you are plugging in to are rated to supply enough power.
It is likely there is a failure of one of the power supply voltages. The solution requires troubleshooting that is NOT DIY unless you are electronically skilled.
The output stage has a problem. From your description, I'd guess that the high voltage supply has failed. The low volume and distortion suggests that you are trying to power the speakers from the driver section rather than the outputs. There is a resistor that fails in some of this series. If I remember correctly it is either a 2K or 3K resistor 10 watts in size. If you have no experience with repairs, I'd seek a service shop that is familiar with these units. The part runs between $5-$10.
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