Want a very smooth and rich tone with less grit? This is our Gold Pin Option Retube Kit for the Bad Cat Black Cat 15R Heads and Combo Amps. It uses six Gold Pin ECC83S's with one being current balanced for the phase inverter, a Gold Pin EF806 to replace the EF86 in V3 and a GZ34 rectifier tube. 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).