Want a really smooth and rich tone with less grit for your Ultra 60? This is our Gold Pin Option Retube Kit and it contains three standard Gold Pin ECC83S's for V1 thru V3 and a balanced Gold Pin 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.