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(!!!) (#1 231D Pair) 231D Western Electric engraved base

(!!!) (#1 231D Pair) 231D Western Electric engraved base "D" getter halo like new 1930's (2.0ma and 2.2ma) tested on Amplitrex

$ 149.99

1 pair) 231D WE "engraved base" and "D" getter halo used/good in white boxes 1930's

1 tube) 2.0ma Gm=500 brass pins - cleaned

1 tube) 2.2ma Gm=500

Vplate=90V

Vgrid=-3V

Good Ma 1.6-2.1ma

Good Gm=400-500

 

General Information

3V Filament @ 60ma, Vplate=90V, Iplate=2.1ma, Mu=8.4, Gm=510, Rp=16Kohms, Pout=4.5mW

Similar to UV-199 and 864

 

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