Want a really rich and smooth tone with less grit? This is our Gold Pin Option Retube Kit for the Soldano Avenger 50 and Hot Rod Avenger 50 Amps. It uses four Gold Pin 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 KT66's or JJ 5881's to drop the power output a couple decibels by clicking on the "Customize" button!