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ID = 27595
Brand: Common type Worldwide tube/semicond.
Developer: EMI; Hayes, Middlesex 
Tube type:  Reflex Klystron   SHF/EHF (>3 GHz) 
Identical to CV35
Similar Tubes
Normally replaceable-slightly different:
Other characteristic (electr. data):
Other base and data slightly different:
Multiple differences or of other kind:
First year 1941 - - Data from my own collection
Predecessor Tubes NR89  
Successor Tubes CV314  

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Was used by Radar
Filament Vf 4 Volts / If 1.45 Ampere / Indirect / Specified voltage AC/DC

Designed by EMI in 1941 to replace the early 10-cm reflex klystron family known as 'Sutton tube', the Admiralty NR89 and the Air Ministry 10E/501. The diameter of the interaction gap was made smaller and the flat reflector was mounted close to it.

Manufactured by EMI and likely by E.K. Cole. After initial assembly by the Radiophysics division of the Australian Council for Scientific Research, also made by Australian Standard Telephones Pty in New South Wales from 1942.

  • Factory installed external cavity; 2970 to 3095MHz tuning.
  • 100mW minimum output power.

The geometry of these early klystron made necessary the use of a quite high cavity voltage, 1 to 1.5kV, a severe limitation in airborne use.

Information source -- Original-techn. papers.   

8fhb~~7.png CV35: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad
CV35: Manufacturer's Literature
Emilio Ciardiello

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