Want all the gain you can get? This is our High Gain Option Retube Kit for the Ampeg GVT52-112 & GVT52-212 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!