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ID = 57001
United States of America (USA)
Brand: Penta Laboratories; Chatsworth (CA)
Developer: Eimac (brand name) 
Tube type:  Transmitting Triode, air cooled   VHF 
Identical to PL-185 = 527A

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.

PL-185 is the Penta Labs proprietary code for 527A.

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