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ID = 9267
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Pulse magnetron   SHF/EHF (>3 GHz) 
  Ca. 1925 up to 1945 extraordinarily rare. Production was less than 100 items. ****
Identical to LMS12 = LM566/3
Similar Tubes
Other characteristic (electr. data):
Predecessor Tubes LM566/3  
Successor Tubes LMS13   LMS15   LMS14   LMS16  

Was used by Radar
Filament Vf 12.6 Volts / If 1.8 Ampere / Half indirect

LMS12 was one of the few multi-cavity magnetrons designed in Germany during the war. Intended to operate at 3 cm, its anode block had 18 cavities. As opposed to LMS10, copied from a British magnetron, this looks to be an original German design. The system of resonators is placed transversely with respect to the tube axis. Anode and cathode were assembled on a ceramic disc and then inserted into the upper sleeve and brazed to it. Anode was conduction-cooled through the sleeve to a suitable radiating mount. Some doubts arise on the efficiency of a 18-cavity structure, but likely German technicians relied on a control loop on the current flowing in the electromagnet to stabilize its operation.

  • 16 kV at 10 to 15 A input pulses. 1900 to 2100 gauss magnetic field.
  • 3.05 to 3.35 cm wavelength
  • 10 kW output power typical

Used in a few tens of Berlin D airborne X-band radar sets and in some other sets still experimental when the war ended.

Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Collector info (Sammler)   
LMS12: Private collection
Emilio Ciardiello


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