Looking to warm up your Maverick? This is our Standard Retube Kit for the Mesa Boogie Maverick Heads and Combo Amps. It contains a GZ34 rectifier tube along with six ECC83S's with one of them being current balanced for the phase inverter in V6. The default power tubes are a matched quad of the JJ EL84's but you can configure this kit to use the JJ EL844's by clicking on the "Customize" button!