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(!!!) (2nd Best Pair) 311B Amperex made in Russia NOS 1977 (31.8ma and 33.2ma) (very good construction)
(!!!) (2nd Best Pair) 311B Amperex made in Russia NOS 1977 (31.8ma and 33.2ma) (very good construction)
$ 59.99
1 pair) 311B Amperex made in Russia NOS 1977 large getters - excellent conditon
1 tube) 31.8ma Gm=2850
1 tube) 33.2ma Gm=2900
Tested on Amplitrex
Vplate=180V
Vscreen=135V
Vgrid=-15V
Good Ma = 30ma
Good Gm = 2800-2900
See more: vacuum tube
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 (2nd Best Pair) 311B Amperex made in Russia NOS 1977 (31.8ma and 33.2ma) (very good construction)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_63a075d9-b1e5-4b5c-9acd-b2e94e80219e.jpg?v=1592403860){kind=link}
 (2nd Best Pair) 311B Amperex made in Russia NOS 1977 (31.8ma and 33.2ma) (very good construction) "Pin It")