Do you like FAT mids and some extra high end sparkle? This is our ECC803S V1 Option Retube Kit for the Mesa Rectoverb 25 Heads and Combo Amps. It contains a Long Plate ECC803S for V1 along with five ECC83S's with one being current balanced for the phase inverter in V4. 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!