The BPC MKII Tone Bender is a detailed replica of the 1966 PROFESSIONAL MK II Tone Bender pedals created by Gary Hurst. The circuit unlike the MK 1.5 had a 3 Transistor circuit that based on producion and supply comprised of either OC75’s or OC81D transistors, this OC75 Loaded MK II can be heard on the iconic Track ‘Keep on Runnin’ by the Spencer Davis Group.