Want the maximum gain you can get and the earlier breakup of the JJ EL844's? This kit contains a matched pair of JJ EL844's to drop the overall output a couple decibels for the power section. Two handpicked high gain ECC83S's for V1 and V2, two standard ECC83S's for V3 and V4, and a balanced ECC83S for the phase inverter in V5. Max grind!