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ID = 42690
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to CV4072
Similar Tubes
Other base:
Other base and data slightly different:
  CV404 ; HR7

Base Wires Top contact with a cap.
Filament Vf 4 Volts / If 1.25 Ampere / Indirect / Specified voltage AC/DC
Description Wire ended version of the CV4071

Va<6.2kV rms; 40mA mean. 
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Information source - - Manufacturers Literature   
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