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(!) (Pair) 12B4A RCA NOS 1966-1974 (31.5ma and 36.5ma)
(!) (Recommended Pair) 12B4A RCA NOS 1969-1971 (42ma and 47ma)
(!) (Recommended Pair) 12B4A Sylvania NOS 1960's (26ma and 27ma)
(PAIR) 12B4A Sylvania NOS 1960's - 1970's (33ma and 36.5ma)
12B4A GE branded Westinghouse NOS 1964 (35.5ma)
