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(!!!!) (Pair) 12B4A GE NOS rebranded Raytheon and RCA 1960's (35ma and 37.5ma) (same Gm)
(!!!) (Recommended Pair) 12B4A Sylvania and Sylvania Westinghouse NOS 1950's - 1960 similar build (42.5ma and 45.5ma)
(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)
(!) (Pair) 12B4A RCA NOS 1971-1974 (42ma and 36.5ma)
(!) (Recommended Pair) 12B4A Sylvania NOS 1960's (26ma and 27ma)
12B4A RCA NOS 1960's (31.5ma)
12B4A Sylvania NOS 1960's (33ma)
