MikeyG happened to mention that the Groove Tube amps are great on another thread and I agree . Seems that there isn't to much discussion about these amps. Their trio preamp and Solo 75 amps are real nice amps. The 2 channel Solo 75 amp can switch between Class A and Class AB. The clean channel is real clean. Almost 63 Bassman clean. Works with my Gretsch & Strat very nicely. The mean or gain channel is 80's brown. Both channels can be blended(clean & mean). Over all a nice amp. Sometimes they pop up on ebay at a reasonable price.