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(!!) (#1 231D Pair) 231D Western Electric NOS 1948-1949 with data sheets (2.0ma and 1.9ma)

$ 199.99

1 pair) 231D Western Electric NOS 1948-1949 with data sheets

1 tube) 2.0ma Gm=500 (926=1949)

1 tube) 1.9ma Gm=500 (839=1948)

Tested on Amplitrex

Vplate=90V

Vgrid=-3V

Good Ma = 1.6-2.1ma

Good Gm = 400-500

 

Buy 2 pairs receive 5% discount


 

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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