Looking to warm up your Hot Cat 50R? This is our Standard Retube Kit for the Bad Cat Hot Cat 50R Amps. It uses seven ECC83S's with one being current balanced for the phase inverter. The default power tubes are a matched pair of the JJ Electronic E34L's but you can configure this kit to use the JJ EL34II's, EL34’s, KT77’s or Big Bottle 6CA7’s by clicking on the "Customize" button!