Want a really smooth and rich tone with less grit? This is our Low Output Gold Pin Option Retube Kit for the VOX AC30HW Heads and Combo Amps. It contains a matched quad of JJ EL844's for power to drop the overall output a couple decibels, a GZ34 rectifier tube along with five Gold Pin ECC83S's one of them being current balanced for the phase inverter in V5.