Want all the gain you can get? This is our High Gain Option Retube Kit, it uses a standard ECC83S in V4 for the FX loop and four handpicked High Gain ECC83S's with one being current balanced for the phase inverter in V5. The default power tubes are a matched pair of the JJ EL84's but you can configure this kit to use the JJ EL844's to drop the power output a couple decibels by clicking on the "Customize" button!