(!!) (#1 37 Pair) 37 RCA NOS 1940's (8.5ma and 8.5ma) 1% matched
$ 27.99
Sorry, this product is sold out!
1 matched pair) 37 RCA NOS 1940's same build
1 tube) 8.5ma Gm=1100
1 tube) 8.5ma Gm=1100 RCA made for Marconi Canada
Test parameters:
Vplate=250V
Vgrid=-18V
Good Iplate Ma range = 6.5-8ma
Good Gm=1000-1100
(Filament=6.3V @ 300ma, many think the 37 sounds better than the 76)
See more: vacuum tube
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 (#1 37 Pair) 37 RCA NOS 1940's (8.5ma and 8.5ma) 1% matched&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/37p3.jpg?v=1571439280){kind=link}
 (#1 37 Pair) 37 RCA NOS 1940's (8.5ma and 8.5ma) 1% matched "Pin It")