(!!!!) (Recommended Pair) 311B Western Electric NOS 1973 and 1975 (35.2ma and 36.4ma)
$ 188.88
1 pair) 311B WE NOS "O" getter halos in white boxes
1 tube) 36.4ma and Gm=3250 (1973)
1 tube) 35.2ma and Gm=3150 (1975)
Tested on Amplitrex
Vplate=180V
Vscreen=135V
Vgrid=-15V
Good Ma = 30ma
Good Gm = 2900
See more: vacuum tube
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 (Recommended Pair) 311B Western Electric NOS 1973 and 1975 (35.2ma and 36.4ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_b780b923-de4e-4a19-bbf2-b167d31ca1b8.jpg?v=1581720363){kind=link}
 (Recommended Pair) 311B Western Electric NOS 1973 and 1975 (35.2ma and 36.4ma) "Pin It")