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ID = 77809
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  MICROWAVE AND RADAR, general 
Identical to V261C/1M

Base Loctal-8, B8G (Sylvania, 1938)
Filament Indirect

H-wave Heil oscillator. Similar to Heil oscillators, this tube uses a short-circuited section of waveguide for electron bunching.

  • 5850 to 6350 MHz tuning range
  • 800 mW minimum output power
  • 530 Vanode voltage, 60 mA cathode current
  • 8.5 MHz minimum electronic tuning range
  • Fits WG14 waveguide

Information source - - Manufacturers Literature   
V261C/1M: Private collection
Emilio Ciardiello


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