Is the sweet spot for your Maz just a little to loud for you? This is our Low Output Standard 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 JJ ECC81 to replace the 12AT7 along with four JJ ECC83S's with one being current balanced for the phase inverter in V5.