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ID = 35418
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  Vacuum Pentode 
Identical to 399B
Similar Tubes
Heater different:
  1T4 ; 399A

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament Vf 1.15 Volts / If 0.65 Ampere / Indirect
Description Miniature pentode for telephone carrier repeaters. Similar to 1T4 with different heater voltage. Indirect heating version of 399A. 
Information source Tube Lore (I)   

7wa_1.png 399B
Emilio Ciardiello

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