So i picked up one of these from GC 2 weeks ago with the matching cab. Clean channel is great. But im having a hard time getting a good tone from the other 2 channels. The amp sounds nasaly on 2 and 3. cant quite put my finger on it just sounds real fizzy too processed sounding, I keep the master at 3 or below. Its not a tube problem iv swapped preamp tubes around. Guitars i play through are les paul standard with stock burstbucker pickups and a home made frankenstrat with EVH Frankenstein pickup i play mostly van halen stuff other thing i wanted to add was that i really have to crank the high's all the way up and the presence pretty close to max so it doesn't sound muddy.