This kit contains a matched pair of JJ EL844's to drop the overall output a couple decibels for the power section. A JJ ECC803S for V2 which is the clean channel for a little lower gain with big thick mids and a little more sparkle in the highs. Three standard ECC83S's for V1, V3 and V4 and a balanced ECC83S for the phase inverter in V5.