(!!!) (Recommended Pair) 12B4A Sylvania and Sylvania Westinghouse NOS 1950's - 1960 similar build (42.5ma and 45.5ma)

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1 pair) 12B4A Sylvania and Sylvania Westinghouse NOS 1950's - 1960 similar build 1 tube) 45.5ma Gm=8000 "O" getter and black heatsink fins on grid posts 1 tube) 42.5ma Gm=7600 "U" getter Matched on Amplitrex Vplate=140 Vgrid=-15V Good Ma range 25-40ma Good Gm = 6000 Show more