Want all the gain you can get? This is our High Gain Option Retube Kit for the Blackheart BH15 Handsome Devil Heads and Combo Amps. It uses two handpicked High Gain ECC83S's with one being current balanced for the phase inverter in V2. The default power tubes are a matched pair of the JJ EL84's. With the Customize option you can configure this kit to use the JJ EL844's which will drop the power output a couple decibels (ideal for players wanting decreased headroom/output).