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28D7W

Information - Help 
ID = 57861
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer:  
Tube type:  Double Beam Power Tube   Power/Output 
Identical to 28D7W
Similar Tubes
Other class quality (otherwise equal):
  28D7 ; GB-28D7W

Base Loctal-8, B8G (Sylvania, 1938)
Filament Vf 28 Volts / If 0.4 Ampere / Indirect
Description Ruggesized version of 28D7. 
Literature - - Manufacturers Literature   
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28d7w_1.jpg
28D7W: S.D.
Siegfried Droese

 
28d7~~2.png
28D7W: Manufacturer's Literature
Emilio Ciardiello

 


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