Want the earlier breakup of the JJ EL844's and all the gain you can get? This is our Low Output High Gain Option Retube Kit for the VOX AC15HW1. It contains a matched pair of JJ EL844's for power to drop the overall output a couple decibels, a JJ EZ81 rectifier tube along with three handpicked High Gain ECC83S's with one being current balanced for the phase inverter in V3.