Looking for a warmer tone from your Ultra 60? This is our standard Retube Kit and it contains three standard ECC83S's for V1 thru 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 a combo amp 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.