All-tube two-channel 50W amplifier head for electric guitar that unites vintage Supro tone with modern channel switching functionality, tube-driven reverb and a multi-purpose, all-tube effects loop. Its red channel found uses the two-knob preamp from the legendary Supro Thunderbolt amplifier for high-headroom rock and roll power, while the blue channel contains the high-gain preamp, 2-band EQ and all-tube reverb section of the acclaimed Comet model. The amp provides A/B/Both channel switching operation, allowing the two channels to be run in parallel, creating a massive, dual-preamp sound where each channel contributes part of the overall texture. In addition to the tube-driven spring reverb, the blue channel contains an all-tube, switchable effects loop that provides a set of useful functions including “wet only” reverb effects, which can be independently dialled in and blended with the dry sound from the red channel. The variable send and return levels allow the effects loop to function as a level and/or gain boost when engaged and can also act as a master volume for the blue channel when bedroom levels are desired. The 50-watt power amp is switchable between Class A and Class AB operation: the Class-A (cathode bias) setting provides the distinctive midrange growl, the Class AB (grid bias) configuration presents less compression along with additional headroom, more punch and faster attack. The amplifier comes loaded with military-grade Sovtek power tubes that are precision-matched at the Supro factory in Port Jefferson, NY. A channel switch is included. Dimensions: 610 x 356 x 298 mm. Weight: 14.7 kg.