Looking for the smoothest richest tone you can get? This kit uses a matched pair of the JJ EL84's for power along with three Gold pin ECC83S's for V1, V2 and V3, one standard ECC83S for V5 along with a balanced Gold pin ECC83S for the phase inverter in V4. Very smooth and rich! 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.