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Got one of these for free cause it's "broken", when I had a go the clean channel works fine, as does all the built in effects, it's only the dirt channels that are a bit wonky.
Drive 1 channel just crackles and fizzes but no guitar signal
Drive 2 channel kinda works, it's just the volume drops and it's also pretty noisy.
It's worth mentioning all the pots being noisy anyway so those need a clean.
I found the manual with schematic on here (http://www.manual-girls.com/model.php?id=191) and noticed the clean channel doesn't go through the tube preamp, so is the tube probably dead?