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Troubleshooting suggestions for a subwoofer plate amp?

Posted by Ewalaa on July 21, 2020 at 19:30:37:
This is nothing more than a COVID project.

I have a subwoofer plate amp removed from from a long gone Onix UFW-10. It powers up, passes signal, and all controls function normally, but the output has a distortion which rides along with the music/bass. The bass output is strong but mirrored by a scratching noise. It sounds almost like a blown driver would sound, but the woofer being used is good.

I don't have a schematic, and I don't see any bulging caps or missed solder joints. A google search brings up a hum and power supply cap issue, but this one is dead quiet without a signal.

My guess is a bad output transistor, but it would take quite a bit of disassembly to get to them in order to test or replace. Do you think that I'm on the right track?

Thanks,
Ed