(!!) (#1 37 Pair) 37 RCA NOS 1940's (7.3ma and 7.5ma)
By Tube World
$ 27.99
Sorry, this product is sold out!
1 matched pair) 37 RCA NOS 1940's same build
1 tube) 7.3ma Gm=1100
1 tube) 7.5ma Gm=1000
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
Share:
 (#1 37 Pair) 37 RCA NOS 1940's (7.3ma and 7.5ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/37p2.jpg?v=1571439279){kind=link}
 (#1 37 Pair) 37 RCA NOS 1940's (7.3ma and 7.5ma) "Pin It")