A matched quad of JJ EL84's for the power section. A JJ ECC803S for V1 for a little lower gain with big thick mids and a little more sparkle in the highs. Four standard ECC83S's for V2 thru V5 and a balanced ECC83S for the phase inverter in V6. Just let us know in the comments section if you're looking for an early breakup, a moderate breakup or a later breakup for more headroom in which case we will choose the coolest grades we have available for the power tubes.