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X404

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ID = 81947
       
Country:
United States of America (USA)
Brand: Eimac (brand name)
Tube type:  Transmitting Triode, air cooled 
  Ca. 1925 up to 1945 no serial production. For instance only development samples. *****
Identical to X404
Similar Tubes
Other base and data slightly different:
  4X500A

Filament

Collection of

 
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