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(!!!!) (Best Pair) 311B Amperex made in Russia NOS 1977 (34.2ma and 34.5ma) (very good construction)
(!!!!) (Best Pair) 311B Amperex made in Russia NOS 1977 (34.2ma and 34.5ma) (very good construction)
$ 59.99
1 pair) 311B Amperex made in Russia NOS 1977 large getters - excellent condition
1 tube) 34.2mA Gm=3000
1 tube) 34.5mA Gm=3050
Tested on Amplitrex
Vplate=180V
Vscreen=135V
Vgrid=-15V
Good Ma = 30ma
Good Gm = 2800-2900
See more: vacuum tube
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 (Best Pair) 311B Amperex made in Russia NOS 1977 (34.2ma and 34.5ma) (very good construction)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_c0745683-72e0-4504-b898-2acfc1d83d2e.jpg?v=1592403886){kind=link}
 (Best Pair) 311B Amperex made in Russia NOS 1977 (34.2ma and 34.5ma) (very good construction) "Pin It")