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ID = 9283
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Magnetron   UHF 
Identical to RD4Ma = LM318

Base SPECIAL TUBEBASE in general (Codex=sp) 2 Top contacts.
Filament Vf 3.3 Volts / If 4.2 Ampere / Direct

CW magnetron designed to operate as oscillator at wavelenghts from 18 to 26 cm, delivering 12 to 16 W output power. Direct heated tungsten cathode.

  • 30 to 40 mA max anode current at 1300 to 900 volts
  • 1100 volts at 40 mA typical operation, delivering 14 W at 20 cm
  • 1300 to 1400 gauss magnetic field
  • 40 W max anode dissipation.

Frequency modulation in the order of 100 to 200 KHz/V could be obtained by anode voltage modulation.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
40 x 125 x 46 mm / 1.57 x 4.92 x 1.81 inch
Weight 93 g / 3.28 oz
Tube prices 3 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
RD4Ma: o
Anonymous 15 Collector

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RD4Ma: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

RD4Ma: Telefunken 1943
Robert Schmalstieg

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