Do you like FAT mids and some extra high end sparkle? This is our ECC803S V1 Option Retube Kit for the Mesa Mark Five 25 Amps. It contains one Long Plate ECC803S for V1 along with five ECC83S's with one being current balanced for the phase inverter in V6. The default power tubes are a matched pair of the JJ EL84's but you can configure this kit to use the JJ EL844's for an earlier breakup by clicking on the "Customize" button!