(!!!!) (Pair) 12B4A GE NOS rebranded Raytheon and RCA 1960's (35ma and 37.5ma) (same Gm)
(!!!) (Best Pair) 12B4A GE NOS 1960's (47ma and 48ma)
(!!!) (Best Pair) 12B4A GE NOS 1962-1977 same build (52ma and 53ma)
(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)
(!!) (Recommended Pair) 12B4A GE NOS 1962-1970 (36ma and 36ma)
(!) (Pair) 12B4A GE NOS 1960's (37ma and 38.5ma)
(!) (Recommended Pair) 12B4A Sylvania NOS 1960's (26ma and 27ma)
12B4A RCA NOS 1960's (31.5ma)
12B4A Sylvania NOS 1960's (33ma)
