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ID = 81457
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: EMI; Hayes, Middlesex 
Tube type:  Reflex Klystron   SHF/EHF (>3 GHz) 
Identical to CV11
Similar Tubes
Multiple differences or of other kind:
Successor Tubes CV37  

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Was used by Radar
Filament Vf 4 Volts / Indirect

Early British S-band reflex klystron derived from the 'Sutton tube' prototype. Robert Sutton of the Signal School group at Bristol developed the design of the first reflex klystron, completed in December 1940. Small productions by EMI and E.K. Cole started from March 1941.
Factory assembled cavity with 8% tuning range. It originated the service type CV11, when already discontinued. Intended as local oscillator in radar sets using the NT89 magnetron.

Replaced by CV37 from the end of 1941.

10 mW output at 1750 V resonator voltage.

To an article on the development of early reflex klystron to be used as local oscillator in microwave radar sets.

Information source -- Original-techn. papers.   1946 CV register

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