This is our Gold Pin Retube kit for the Dr. Z Z Wreck Amps. It includes a matched quad of the JJ EL84 for power, one GZ34 rectifer tube and three Gold Pin ECC83S's, with one of them balanced for the phase inverter in V3. This kit provides a smoother and creamier breakup, without the hair or grit on your tone that you get with the standard non-gold pin tubes.