Pettyjohn Electronics Iron MKII PedalProduct Description The Pettyjohn IRON MKII is a full re work of our classic medium gain overdrive. Below is a deep drive into the features of the IRON MKII. All New EQ We sharpened our pencils and set out to improve one of our favorite pedals. We decided to start by vastly increasing the frequency range of the pedal. The original circuit had a decent amount of built in filtering and relatively limited tone shaping tools, which in some rigs could be