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ID = 13963
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Triode, vacuum   UHF 
Identical to CV1197 = RL18 = NR88
Similar Tubes
Normally replaceable-slightly different:
  CV330 ; EC53

Base 3 pin wires in line (1937, B3G) 2 Top contacts.
Filament Vf 6.3 Volts / If 0.25 Ampere / Indirect / Specified voltage AC/DC

600MHz max operation as oscillator. Special base required, anode marked with a red dot.

Information source Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   

ec53_4.png CV1197: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad
CV1197: Manufacturer's Literature
Emilio Ciardiello

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