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ID = 9161
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: EMI; Hayes, Middlesex 
Tube type:  Reflex Klystron   SHF/EHF (>3 GHz) 
Identical to NR89 = NR89_Sutton
Similar Tubes
Other characteristic (electr. data):
Multiple differences or of other kind:
  CV10 ; CV11
Predecessor Tubes Sutton_tube  
Successor Tubes 1941   CV35   REL8A   REL8C   REL8D   REL8B  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ub) 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 CV10, when already discontinued. Intended as local oscillator in radar sets using the NT98 magnetron.

Replaced by CV35 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 Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   Callick, Metres to Microwaves

8fhb~~6.png NR89: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad

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