Looking to warm up your 5012C or 50H? This is our Standard Retube Kit for the Jet City 5012C Combo and 50H Amps. It uses five ECC83S's with one being current balanced for the phase inverter in V5. The default power tubes are a matched pair of the JJ 6L6GC's but you can configure this kit to use the JJ KT66's, 5881's or even the JJ 6V6S's to drop the power output a couple decibels by clicking on the "Customize" button!