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 Option Retube Kit for the Blackstar HT Club 40, 50 and MKII Heads and Combo Amps. It contains two Gold Pin ECC83S's for V1 and V2 along with a Matched Pair of JJ E34L's for the power section but you can configure this kit to use the JJ EL34II's, EL34’s, KT77’s or Big Bottle 6CA7’s by clicking on the "Customize" button.