Want all the gain you can get from your Mesa 22 Series amp?This kit contains a matched pair of JJ EL84's 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. Smokin! 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.