Just got one of these and I think it's awesome. I'm not a huge fan of modding amps, but this one has a master volume mod (thank god). I don't like the cheap plastic knobs and switches. I feel like the EQ doesn't really do as much as I'd like it to do. But overall, this amp is awesome, especially when you can crank it at about 1 o clock, using both inputs. It's so inexpensive too! The guy that had it before me put KT66's in and took the 6L6's out. I'm not too terribly familiar with the differences in tubes, as far as the difference in sound goes. What kind of affect does this have on the amp? I'm pretty sure the pot for my 'Mid' knob is broken, haha.