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56 National Union engraved base used/tests like new 1930's (6.0ma)

Name: 56 National Union engraved base used/tests like new 1930's (6.0ma)
Brand: Tube World
SKU: 56
Price: 13.99 USD
Availability: InStock

$ 13.99

56 National Union engraved base used/tests like new 1930's

6.0ma

Gm=1500

Tested on Amplitrex:

Vplate=250V

Vgrid=-13.5V

Iplate good range = 4.5-5.5ma

Good used Gm=1200-1300

(Vfilament = 2.5 volts)

See more: vacuum tube

Tags: 1930's, 1943, 56, all, black plate, engraved base, Sylvania, triode

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