Looking to warm up your Artisan 15? This is our Standard Retube Kit for the Blackstar Artisan 15 Heads and Combo Amps. It uses two ECC83S's, an EF806 to replace the EF86 and an EZ81 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).