From Two Rock:
The single-channel Classic Reverb Signature is Two-Rock’s ultimate tone shaping machine. Updated in November of 2016 with Bill Krinard’s new design tactics, this amp is Available as either a 40W (4 x 6V6) head or combo, 50W (2 x 6L6) head or combo, and 100W (4 x 6L6) head. Built on either a black or silver aluminum chassis, this amp has been updated with a new output transformer on the 100 watt models, as well as an added Gain Structure switch for 3 different voicing settings on the input stage.
New Signature Features:
Gain Structure: The 3 position gain structure switch changes the sensitivity and overall feel of the preamp. In the down position, the amp feels similar to a vintage blackface, 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 frontend.
Power Selector: On 100 watt (4x6L6) models, the HIGH power mode is100 watts, the LOW power mode is 50 watts. With the 100 watt Classic Reverb Signature’s output transformer, when switching from 100 to 50 watts, the transformer will compensate for impedance differences so you will not have to change impedances.