Home » Power Tubes » 31 Philco by Sylvania engraved base NOS 1930's (11.5ma Gm=1000)

31 Philco by Sylvania engraved base NOS 1930's (11.5ma Gm=1000)

Name: 31 Philco by Sylvania engraved base NOS 1930's (11.5ma Gm=1000)
Brand: Tube World
SKU: 31
Price: 14.99 USD
Availability: InStock

$ 14.99

31 Philco by Sylvania engraved base NOS 1930's

11.5ma

Gm=1000

Tested on Amplitrex

Vplate=180V

Vgrid=-30V

Good NOS Ma = 11-12ma

Good NOS Gm = 1000

power triode

See more: vacuum tube

Tags: 1940's, 31, all, National Union, power tubes, triode

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