Great little combo. 3 channels. Clean, Driven, Boost! Only drawback is there's no reverb, but it sounds so good, I hardly noticed! Beauty of this amp is that it's 5w/15w switchable, making it great for jams, small gigs AND bedrooms! The TS circuit is built into the preamp, and 2x 12ax7 tubes, and powered by 2x 6v6 tubes. GREAT cleans, awesome crunch tones, and there's an efx loop, so you can throw in a harsher sounding distortion, and still retain the gainboost and the 6dB volume boost! 1x12 Celestion Seventy80 speaker. Some say it sounds thin, but I think it's really nice, especially when ythe amp is cranked. It doesn't break up much even on full volume, and that's where the TS circuit comes in handy!