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ID = 28094
Tube type:  Pulse magnetron 
  Ca. 1925 up to 1945 very rare. ***
Identical to CV209 = MX57
Similar Tubes
Normally replaceable-slightly different:
Predecessor Tubes CV108   725A  

Was used by Radar
Filament Vf 6.3 Volts / If 0.8 Ampere / Half indirect

When in December 1942 in UK arrived design details of WE 725A strapped X-band magnetron both BTH and GEC were asked by TRE to design their own tubes, derived from that type. BTH, with the help of Sayers, the one who had devised the strapping technique at Birmingham, designed first the MX52 and soon later the MX57. In a magnetic field of 5000 Oe, it operated with an efficiency around 35%, giving about 45 kW output pulses. The design was completed in the summer 1942 and approved as CV209. Fitted with iron polepieces, it was supplied as plug-in replacement for CV108.

There was no volume production. TRE had already decided the use of WE 725A in new radar sets, so that CV209 was just used as replacement for CV108 in maintaining old sets.

13 kV at 11.5 A input, 45 kW output pulses typical. 9375 MHz.

Information source -- Original-techn. papers.   
-- Original prospect or advert   Callick, Metres to Microwaves
-- Collector info (Sammler)
CV209: Private collection
Emilio Ciardiello

CV209: Manufacturer's Literature
Emilio Ciardiello

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