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(!!!) (Recommended Pair) 12B4A Sylvania and Sylvania Westinghouse NOS 1950's - 1960 similar build (42.5ma and 45.5ma)
(!!!) (Recommended Pair) 12B4A Sylvania and Sylvania Westinghouse NOS 1950's - 1960 similar build (42.5ma and 45.5ma)
$ 27.99
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
See more: vacuum tube
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 (Recommended Pair) 12B4A Sylvania and Sylvania Westinghouse NOS 1950's - 1960 similar build (42.5ma and 45.5ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/3_1_e83a8cce-bae6-441a-9769-079d84e4eca0.jpg?v=1769064671){kind=link}
 (Recommended Pair) 12B4A Sylvania and Sylvania Westinghouse NOS 1950's - 1960 similar build (42.5ma and 45.5ma) "Pin It")