Looking to warm up your 2112RC? This is our Standard Retube Kit for the Jet City 2112RC Combo Amps. It uses five ECC83S's with one being current balanced for the phase inverter in V4. The default power tubes are a matched pair of the JJ EL84's but you can configure this kit to use the JJ EL844's to drop the power output a couple decibels by clicking on the "Customize" button!