Want all the gain you can get? This is the High Gain Option Retube Kit for the Ampeg V50H Amps. The preamp section uses two handpicked High Gain ECC83S's with one balanced for the phase inverter in V2. The default power tubes are a matched pair of the JJ Electronic E34L’s but you can configure this kit to use the JJ EL34II's, EL34’s, KT77’s, Big Bottle 6CA7’s by clicking on the "Customize" button.