Synergy Friedman BE-BB, Pre-amp module for Synergy system, Developed by Dave Friedman, Is based on the Friedman BE and Buxom Betty amps, 2 Channels, Tubes: 2x 12AX7, 3-Band EQ, Separate gain and volume control, BE Channel controls: Gain, Bass, Mid, Treble, Volume, BB Channel controls: Gain, Bass, Mid, Treble, Volume, Switches: BB Channel 3-way Bright Switch and 2-way Mid Boost, Dimensions (W x D x H): 17.8 x 14 x 3.8 cm, Weight: 454 g