I am having a really gross sounding distortion from my amp. It's a Peavy Solo Trans Tube IV. I've plugged in my acoustic and electric and I've tried several different cables but still the same problem. no over ride my low mid and high is all on 5 and it's still badly distorted
A "gross" sounding distortion in a solid-state amplifier makes me think it's a speaker problem, since we can rule out any faulty tubes.
Check your speaker - use a flashlight, if possible to try and see if there's any visible tears through the open holes of the speaker, through the back of the amplifier (assuming it's an open-back design). If that's not possible, you'll need a way to remove the speaker to see if there's anything that looks awry.