Want the smooth rich Gold Pin tone and the earlier breakup of the JJ EL844's? This is our Low Output Gold Pin Option Retube Kit for the Dr. Z M12 Heads and Combo Amps. It contains a matched pair of JJ EL844's for power to drop the overall output a couple decibels, a JJ 5Y3S rectifier tube, along with a Gold Pin JJ EF806 for V1 and a current balanced Gold Pin JJ ECC83S for the phase inverter in V2.