Looking for a warmer tone and better definition from your Coupe? This is our Standard Retube Kit for the Kustom Couple 36 Combo Amps. This kit contains four ECC83S's with one being current balanced 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!