37 RCA Cunningham engraved base like new 1930's (8.3ma)

Name: 37 RCA Cunningham engraved base like new 1930's (8.3ma)
Brand: Tube World
SKU: 37
Price: 19.99 USD
Availability: InStock

$ 19.99

37 RCA Cunningham engraved base like new 1930's in WB

8.3ma

Gm=1100

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)

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