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Unknown_triode

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ID = 56869
       
 
   
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to Unknown_triode

Base Swan-Bajonett B15
Was used by Military and/or Government
Filament Direct / Battery =
Description This tube has a B15 bayonet base but the elements appear to be of Western Electric origin and is most likely experimental telephone repeater tube and British made. It appears to date about 1914 - 1918. No other information available. 
Dimensions (WHD)
incl. pins / tip
x 104 x 60 mm / x 4.09 x 2.36 inch
Weight 38 g / 1.34 oz
Information source - - -   
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Just Qvigstad
Usage in Models 1= 1928 ; 1= 1937?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2

Collection of

 
unknown_triode.jpg

 

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