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31C2

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ID = 31578
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Tube type:  CRT (cathode ray tube, picture tube)   Indication 
Identical to 31C2
Similar Tubes
Normally replaceable-slightly different:
  31C1
Heater different:
  31C14/T1 ; CV5119
Successor Tubes CV5119  

Base Duodecal (12-pin), B12A (not glass)
Filament Vf 4 Volts / If 0.72 Ampere / Indirect / Specified voltage AC/DC
Description 6" measurement tube for DF Compass.
Concave face with integral compass marks. 
Information source - - Manufacturers Literature   
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Just Qvigstad
31c2_mazda_data_01.png
31C2: Original data sheet
Michael Poll

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