Want that FAT mid high end sparkle of the Long Plate ECC803S and the earlier breakup of the JJ EL844's? This is our Low Output ECC803S V1 Option Retube Kit for the Dr. Z Mazerati. 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 Long Plate JJ ECC803S for V1 and a current balanced 5751 for the phase inverter in V2.