Do you like FAT mids and a sparkling high end? This is our ECC803S V1 Option Retube Kit for the Dr. Z Mazerati. It contains a matched quad of JJ EL84's for power, a JJ GZ34 rectifier tube along with a Long Plate JJ ECC803S for V1 and a current balanced JJ 5751 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.