Many pedals try to emulate the sound of tube breakup; we decided instead of emulating tube distortion, wed use actual vacuum tubes and give you the real deal in a compact pedal. The heart of the MTGs design is a NOS (New Old Stock) US-made 6205 preamp tube. 3-Band EQ with Tight control and switchable boostwith its own Level and Boost controlsmakes it easy to dial-in just the right sound.