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ID = 56999
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Eimac (brand name) 
Tube type:  Transmitting Triode, air cooled   Text 
Identical to 527A = PL-185
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general
Was used by Radar
Filament Vf 5.5 Volts / If 135 Ampere / Direct

Power triode used either as VHF oscillator or as radar pulse modulator. Thoriated tungsten filamentary cathode.

  • 300 W plate dissipation
  • 20 kV plate voltage
  • 100 A peak filament emission

Four tubes in AN/TPS-18 gave 1MW RF at 210-225MHz. As modulator, one single tube could switch 30KV at 60A.

Information source -- Original-techn. papers.   Pulse Generators, MIT Rad. Lab., vol. 5
Tube Lore (I)   
Tube Lore (II)
-- Collector info (Sammler)

Collection of



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