Ibanez have really pulled out all the stops with the design of this pedal, achieving a true high voltage valve pre amp. While the tube in many 9-volt tube-overdrive pedals merely functions like a filter, the TK999 Tube King, with its 12AX7 tube, gets a genuine high voltage, just like a tube preamp.

The result ? The Tube King can make any solid-state amp sound just like a tube amp, with massive, tight overdrive/distortion. Awesome.