Want a very rich and smooth tone with less grit? This is our Gold Pin Option Retube Kit for the Dr. Z M12 Heads and Combo Amps. It contains a matched pair of JJ EL84's for power, a JJ 5Y3S rectifier tube, a Gold Pin JJ EF806 for V1 and a current balanced Gold Pin ECC83S for the phase inverter in V2.
Just let us know in the comments section if you're looking for an early breakup, a moderate breakup or a later breakup for more headroom in which case we will choose the coolest grades we have available for the power tubes.