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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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Tube-number record

F-3X2500F3

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BrandFederal
ClassPower Triode
BaseSpecial / none

Construction

Primary TypeTriode
EnvelopeGlass/Metal
Base MaterialMetal
Sections1

Filament / Heater

MaterialThoriated tungsten

Absolute Maximum Ratings

Plate Voltage6000 V
Plate Dissipation2500 W
Grid 1 Voltage-500 V
Cathode Current2500 mA

Audio Performance

Power Output13000 W
Key Features
  • Forced-air cooled anode
  • Thoriated tungsten filament
  • Anode capable of dissipating 2.5 kW
  • Grid and filament connectors attached

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class-C RF Power Amplifier or Oscillator6000 V20000—202080 mA
Class AB2 Audio (Two Tubes)6000 V—4650203000 mA
Class-C Telephony (Plate Modulated)5000 V—1400201450 mA

Application Notes

Cooling air to radiator and filament seals should be applied before filament power and continued for five minutes after removal of filament power.

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