The Classic Reverb Signature represents the superb quality that resides within the Two Rock brand. It truly acts like a swiss army knife of options within the switches and cascaded FET/normal gain controls, giving a tasteful extension on the Dumble designs from which it is based. This amp is in excellent condition, with minimal signs of previous wear.
From Two Rock:
"This amp features our proprietary output transformer as well as an all tube analog spring reverb, 3-position Gain Structure switch, foot switchable FET circuit, tone stack bypass, and Reverb Defeat which all together gives this amp a wide range of tonal possibilities, and have made the Classic Reverb Signature such an integral part of so many artist’s guitar rigs. The 3-position Gain Structure switch changes the front end sensitivity and overall feel of the preamp; in the down position the amp feels similar to a vintage black-panel, the middle position is much like the Two-Rock Matt Schofield Signature front end with a hotter input stage, and the full up position is our traditional Two-Rock front end. On the 40/20 watt version the power output is switchable from 40 watts to 20 watts. When switching wattages on the 100/50w and 40/20w versions, our proprietary output transformer compensates for impedance and phase differences so there is no adverse affect on the tone or feel of the amplifier."