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(!!!) (Recommended Pair) 76 Sylvania NOS - 1 tube branded National Union 1947 era same build (5.3ma and 5.6ma)
(!!!) (Recommended Pair) 76 Sylvania NOS - 1 tube branded National Union 1947 era same build (5.3ma and 5.6ma)
$ 44.44
1 pair) 76 Sylvania NOS original boxes 1940's same build
1 tube) 5.6ma Gm=1400 Sylvania 1947 era - mica flake inside tube
1 tube) 5.3ma Gm=1300 branded Nat. Union 1947
Matched on Amplitrex
Vplate=250V
Vgrid=-13.5V
Good Ma range = 4.5 - 5ma
Good Gm range = 1300-1400
See more: vacuum tube
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 (Recommended Pair) 76 Sylvania NOS - 1 tube branded National Union 1947 era same build (5.3ma and 5.6ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_e520d8b9-d82a-4d6e-a110-e64f982c581d.jpg?v=1728083529){kind=link}
 (Recommended Pair) 76 Sylvania NOS - 1 tube branded National Union 1947 era same build (5.3ma and 5.6ma) "Pin It")