I just got it and it was playing well at first but now i have a problem with the gain channel. It's not loud. Like it was fine but it lost its volume and its not even loud with the volume all the way up. The clean channel is louder. What should i do?
It's probably something to do with the tubes.

Just use your warranty and smile
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Masturbate. A lot. Seriously.

<----This is a man
^i dont think itll have a warranty... they don't make the jcm600 anymore
Probably tube replacement... but dont ask me which to buy, Im a n00b with tubes
replace the tubes, if you play often and at loud volumes, your tubes will not last long, Groove Tubes are good tubes.