Are you after the smoothest richest tone you can get? This kit includes a matched pair of JJ EL84's, two standard Gold Pin ECC83S for V1 and V2 and a balanced Gold Pin ECC83S for the phase inverter in V3. The Gold Pin tubes are a little richer and smother sounding. Just let us know in the comments section if you’re looking for max headroom, moderate or an early breakup so we can select a proper grade for the power tubes.