Want all the gain you can get? This is our High Gain Option Retube kit and it contains a matched pair of JJ EL84's for power and three handpicked High Gain ECC83S's with one being current balanced for the phase inverter in V3. Smokin! Just let us know in the comments section if you're looking for max headroom, moderate, or an early breakup so we can select a proper grade for the power tubes.