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GB-28D7W

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ID = 57862
       
Country:
United States of America (USA)
Brand: Sylvania (Hygrade, GTE, Nilco); Emporium (PA)
Developer:  
Tube type:  Double Beam Power Tube   Power/Output 
Identical to GB-28D7W
Similar Tubes
Other class quality (otherwise equal):
  28D7 ; 28D7W

Base Loctal-8, B8G (Sylvania, 1938)
Filament Vf 28 Volts / If 0.4 Ampere / Indirect
Description Ruggesized, long-life version of 28D7. 
Information source - - Manufacturers Literature   
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28d7~~1.png GB-28D7W: Manufacturer's Literature
Emilio Ciardiello


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