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(!!!) (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm)
(!!!) (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm)
By Tube World
$ 99.99
1 pair) 311B Amperex made in Russia NOS 1977 large getters
1 tube) 37.2mA Gm=3100 3/16" taller
1 tube) 38.5mA Gm=3200
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 Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_70554778-c68d-41b3-a873-1cd5e4c22274.jpg?v=1621434380){kind=link}
 (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm) "Pin It")