Looking to warm up your Black Cat 30? This is our Standard Retube Kit for the Bad Cat Black Cat 30 Heads and Combo Amps. It uses four ECC83S's with one being current balanced for the phase inverter, an EF806 to replace the EF86 in V3 and a GZ34 rectifier tube. The default power tubes are a matched quad 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).