(!) (Pair) 37 Tungsol engraved base 1930's used/test strong (6.8ma and 7.6ma)
$ 29.99
1 pair) 37 Tungsol engraved base 1930's used/test strong
1 tube) 6.8ma Gm=900
1 tube) 7.6ma Gm=1000
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 Tungsol engraved base 1930's used/test strong (6.8ma and 7.6ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_35570cf2-9a81-447f-aa09-93f468ab6e0b.jpg?v=1721170551){kind=link}
 (Pair) 37 Tungsol engraved base 1930's used/test strong (6.8ma and 7.6ma) "Pin It")