Valve - 12AU7 Warm Boost PedalVALVE is an all tube boost pedal (no silicon involved) operating in starved plate and starved heater mode, which is difficult to pull off. Most attempts (Matsumi) have marginal performance due to excess grid current at such low bias. This new design solves those issues breathing new life into the tube, achieving full bandwidth and low noise performance, all while maintaining that gooey non linear tube goodness. This pedal will fatten up your tone like