Looking to warm up your Jet? This is our Standard Retube Kit for the Ampeg Jet 12T and Jet II Combo Amps. It uses two ECC83S's with one being current balanced for the phase inverter in V2. 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!