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ID = 27849
Great Britain (UK)
Brand: EMI; Hayes, Middlesex
Developer: EMI; Hayes, Middlesex 
Tube type:  Klystron, linear Beam   SHF/EHF (>3 GHz) 
  Ca. 1925 up to 1945 extraordinarily rare. Production was less than 100 items. ****
Identical to CV150 = PK150
First year Dec.1941 -- Original-techn. papers.
Predecessor Tubes CV109  

Was used by Radar
Filament Vf 13 Volts / If 2.4 Ampere / Half indirect

This was the only pulse power klystron used at least in British experimental radar and navigation sets during WWII. In origin it was developed to replace the magnetron transmitter in H2S airborne radar sets in operations over continental Europe. This to prevent the capture of the then super-secret magnetron by German troops.
According to Sir Bernard Lowell in his 'Echoes of War' in December 1941 EMI received contracts for 50 Oboe Mark IIB, klystron fitted H2S sets. Unfortunately all the EMI staff, leaded by Alan Blumlein, dead in a plane crash during the comparative tests of H2S radar sets. The entire program was canceled.

CV150 accepted input pulses of 12 kV at 12.5 A, giving output pulses of 30 kW at 3188 MHz. Cathode emission was in the order of 25 A. These figures exceeded that of the CV38 magnetron but of course were soon outdated by the new families of strapped magnetrons. Ed Ginzton, Professor in Physics at Stanford and cofounder of Varian, left an accurate description of the CV150, impressed for its solutions and performances.

Here an article on the development of this tube.

Information source -- Collector info (Sammler)   Echoes of War, Sir Bernard Lowell
-- Original-techn. papers.   Ed Ginzton notes, Stanford University
CV150: Private collection
Emilio Ciardiello


Documents about this component
  TRE report T1473 (AVIA 26/475). The document gives details on the T.R. 3539 transmitter of the blind-bombing system OBOE Mark IIB and of the power klystron CV150 (PK150) developed by British E.M.I. 5107 KB

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