F-Bomb '63 tube spring reverb tank, based on the historic standard but w a refined grounding circuit and highly improved preamp. I spec Mod spring pans in my builds w reissue Tungsol & NOS 6K6 tubes. We use mojotone smooth blonde vinyl and wheat grill cloth for the basic model. Standard upgrade colors choices avail at minimal $20 up charge. Sparkle and Tweed tolex upcharge $50.