This is our ECC803S V1 Option Retube Kit for the EVH 5150 III LBX amps. The preamp section uses a Long Plate ECC803S in V1 for a little less gain, really fat mids and a bit more high end sparkle. Along with the ECC803S this kit includes four ECC83S's with one current balanced ECC83S for the phase inverter in V5. The power tubes are a premium matched pair of the JJ Electronic EL84’s.