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ID = 35225
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Triode, vacuum   Audio Frequency 
Identical to D-87722
Similar Tubes
Other base:

Base Wires only.
Filament Vf 3.1 Volts / If 0.06 Ampere / Direct / Battery =
Description Receiving triode, 231D bulb unbased, with flying leads. Mu = 8.5, Gm 0.38 to 0.56mS. 4000 hours life expectancy; controlled microphonics. Grid and filament spring supported by glass bead from top of plate. Used in 1A Pilot Channel (telephone level regulator of the twenties). 
Information source Tube Lore (I)   
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