BK Butler the original Tube Driver pedal designer is producing a limited number of these classis tube overdrive pedals on a custom order basis. The current production pedal is exactly like the original but with some improved parts. Butler is building them one at a time to his high quality specs to insure great tone and reliability. This is the pedal that Eric Johnson and David Gilmour are using. You can read more about them here. Credit: Butler Audio.�