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 kit uses a JJ 5751 for V1 which is in-between an ECC81 and an ECC83S in gain. For V2 we use a current balanced ECC83S for the phase inverter. The default power tubes are a matched pair of the JJ 6L6GC's. With the Customize option you can configure this kit to use the JJ 5881's which will drop the power output slightly (ideal for players wanting decreased headroom/output).