Mesa Boogie Dual Rectifier Tube Set, JJ Tubes (x4 6L6GC, x5 12AX7, x2 5U4GB) (5)T-12AX7-S-JJ (2)T-5U4GB-JJ (1)T-6L6GC-JJ-MQ (Apex Matched), which contains (4) T-6L6GC-JJ