It's no secret that Stevie played his amps cranked and preferred a little cleaner sound from the front end allowing you to hear more power tube breakup. This is our Low Output SRV Option Retube Kit for the Classic 30, Classic 50 and Delta Blues Amps. It contains a matched quad of JJ EL844's (to drop the output a couple decibels) along with a 5751 for V1, a standard ECC83S's for V2 and a graded high current ECC83S for V3.