This kit is for players who want reduced gain but also need the smooth rich tone of the Gold Pin tubes. This is our Gold Pin SRV kit and it uses a Gold Pin JJ 5751 for V1 which is in-between an ECC81 and a Gold Pin ECC83S along with a Matched Pair of our special Double Mica JJ 6L6GC's for the power section but you can configure this kit to use the JJ 5881's for a reduction in power by clicking on the "Customize" button.