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(!) (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)
