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ID = 37452
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  MICROWAVE AND RADAR, general   SHF/EHF (>3 GHz) 
Identical to V246A/1K
Similar Tubes
Normally replaceable-slightly different:
  CV228 ; CV485 ; DV40B
Other characteristic (electr. data):

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AC/DC

Velocity Modulated Oscillator Tube (VM).
Used as coaxial line oscillator in the range 6 to 7 cm wavelength.
Resonator disc 42mm in diameter.

Depending upon output power selection it can be labeled either as CV228, 450 mW minimum, or as CV485, 250 mW minimum output power.

Dimensions (WHD)
incl. pins / tip
24 x 90 x mm / 0.94 x 3.54 x inch
Information source - - Manufacturers Literature   
V246A/1K: Private collection
Emilio Ciardiello

V246A/1K: Manufacturer's Literature
Emilio Ciardiello

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