This is our Tweed Option kit for the Fender Blues Junior, it contains a matched pair of JJ EL84's for power along with a JJ 12AY7 for V1, a standard ECC83S's for V2 and a balanced ECC83S for the phase inverter in V3. The Tweed Option will drop the gain down a bit more than the SRV Option allowing you to get more power tube breakup at higher volumes. The JJ 12AY7 has a fat warm tone with a big shimmering sparkle in the high end! Just let us know in the comments section if your looking for max headroom, moderate or an early breakup so we can select a proper grade for the power tubes.