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 Budda Superdrive amps too! This kit uses a JJ 5751 for V1 which is in-between an ECC81 and an ECC83S in gain, two ECC83S's one being current balanced for the phase inverter in V3 along with a JJ 5U4GB rectifier tube and a matched pair of JJ KT66's for power.