Want all the gain you can get? This is our High Gain Option Retube Kit for the Gibson GA 30RVH and GA 30RV Heads and Combo Amps. It contains two ECC81's to replace the 12AT7's, a standard ECC83S for the verb in V6 along with four handpicked High Gain ECC83S's with one of them being current balanced for the phase inverter in V7. 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 for an earlier breakup by clicking on the "Customize" button!