Want all the gain you can get and the earlier breakup of the JJ EL844's? This is our Low Output High Gain Option Retube Kit for the VOX AC30CC and AC30HW2. 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 three handpicked High Gain ECC83S's one of them being current balanced for the phase inverter in V3.