Vacuum Tube Set for Mesa/Boogie MK-III Simul 75 Reverb, Apex Matched (5)T-12AX7-S-JJ (1)T-6L6GC-JJ-MP (Apex Matched), which contains (2) T-6L6GC-JJ (1)T-EL34-JJ-MP (Apex Matched), which contains (2) T-EL34-JJ