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(!!) (Pair) 37 Sylvania 1940 era used/good no printing (6.6ma and 6.5ma) (Same Gm) 1-2% matched
(!!) (Pair) 37 Sylvania 1940 era used/good no printing (6.6ma and 6.5ma) (Same Gm) 1-2% matched
$ 29.99
1 pair) 37 Sylvania 1940 era used/good no printing in white boxes
1 tube) 6.5ma Gm=900
1 tube) 6.6ma Gm=900
Test parameters:
Vplate=250V
Vgrid=-18V
Iplate good range 6.5-8ma
Gm=1000-1100
(Filament=6.3V @ 300ma, many think the 37 sounds better than the 76)
See more: vacuum tube
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 (Pair) 37 Sylvania 1940 era used/good no printing (6.6ma and 6.5ma) (Same Gm) 1-2% matched&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/3_1_3f1357bc-dd75-44e4-bb6c-1e9ca4a0df16.jpg?v=1769464316){kind=link}
 (Pair) 37 Sylvania 1940 era used/good no printing (6.6ma and 6.5ma) (Same Gm) 1-2% matched "Pin It")