Want all the gain you can get? This is our High Gain Option Retube Kit. It contains two handpicked high gain ECC83S's for V1 and V2, a standard ECC83S for V3 and a balanced ECC83S for the phase inverter in V4. 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 by clicking on the "Customize" button! If your amp is the combo version and you choose to go with the 6L6GC's then please let us know in the comments section and we will ship your kit with the special Double Mica 6L6GC’s which will greatly reduce any tube rattle.