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ID = 63386
Tube type:  Thyratron Cold-cathode 
Identical to 313C
Similar Tubes
Normally replaceable-slightly different:
  4313C ; CV75
Other characteristic (electr. data):
  313CA ; 313CB ; 313CC ; 313CD ; 430A

Base UX-Base (4 Pins (2 thick, USA 1924, UX)

Cold cathode neon triode. RaBr or Kr-85 activator since 1952. 185V, 35mA.
Variants: 313CA, 200V, 25mA; 313CB, 170V, 25mA; 313CC, 150V, 25mA; 313CD, same as 313CA with viewing window in the lacquer coat.
WE, and NEC on later variants, known manufacturers.

Information source Taschenbuch zum Röhren-Codex 1948/49   
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