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ID = 20312
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: GEC, General Electric Co.; London 
Tube type:  Transmitting Tetrode, air cooled   VHF 
Identical to VT114 = 10E/168 = E1024 = CV1114

Was used by Radar
Filament Vf 10 Volts / If 70 Ampere / Direct

Power demountable tetrode introduced by GEC to replace the NT60 silica valve in high-power radar transmitters. Used in the MetVick CH radar transmitters among the others.

  • 200W average plate dissipation with forced-air cooling
  • 28kV plate voltage
  • Thoriated tungsten filament giving 70A min emission under pulsed operation
  • About 400 kW peak power from a pair driven by NT57
  • 60MHz max frequency
  • Full production from 1940
Text in other languages (may differ)
Information source -- Original-techn. papers.   
-- Original prospect or advert   Callick, Metres to Microwaves, pgs. 36, 37
VT114: Private collection
Emilio Ciardiello


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