Want the smooth rich tone of the Gold Pin tubes and the earlier breakup of the JJ EL844's? This is our Low Output Gold Pin Option Retube Kit for the Dr. Z Maz 38 Heads and Combo Amps. It contains a matched quad of JJ EL844's for power to drop the overall output a couple decibels, a JJ GZ34 rectifier tube, a standard Gold Pin JJ ECC81 to replace the 12AT7 along with four Gold Pin JJ ECC83S's with one being current balanced for the phase inverter in V5.