Want a very smooth tone with less grit? This is our Gold pin Option Retube Kit for the Mesa Boogie Maverick Heads and Combo Amps. It contains a GZ34 rectifier tube along with six Gold Pin 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!