Want all the gain you can get? This is our High Gain Option Retube Kit for the Ampeg R12R and R212R Reverberocket heads and Combo Amps. It uses three handpicked High Gain ECC83S's with one being current balanced for the phase inverter in V3. The default power tubes are a matched pair of the JJ 6L6GC's but you can configure this kit to use the JJ 5881's or even the JJ 6V6S's to drop the power output a couple decibels by clicking on the "Customize" button!