Want the earlier breakup of the JJ EL844 and all the gain you can get? This is our Low Output High Gain Option Retube Kit for the VOX AC15C1 and C2. It contains a matched pair of JJ EL844's for power to drop the overall output a couple decibels along with three handpicked High Gain ECC83S's one of them being current balanced for the phase inverter in V3.