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ID = 17009
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Eimac (brand name) 
Tube type:  Transmitting Triode, air cooled   VHF 
Identical to 527 = 3-300G4
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general (Codex=sp)
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 filament.

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

Four tubes in SK, SR and AN/TPS-18 give 1MW RF at 210-225MHz.

Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   

527_so.png 527: ARRL Handbook 1972
Anonymous 10 Collector

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