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(!!) (#1 37 Pair) 37 RCA NOS 1940's (8.5ma and 8.5ma) 1% matched

(!!) (#1 37 Pair) 37 RCA NOS 1940's (8.5ma and 8.5ma) 1% matched

By Tube World

$ 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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