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. Well, this works really well with the Fender Excelsior amps too! This kit uses a JJ 5751 for V1 which is in-between an ECC81 and an ECC83S in gain and a current balanced ECC83S for the phase inverter in V2 along with a matched pair of JJ 6V6S's for power.