Tube-number record
F-3X2500F3
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F-3X2500F3 is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: brand Federal, year 1953, construction Triode, base Metal, socket Special / none, maximum plate voltage 6000 V, and maximum plate dissipation 2500 W. The archive does not yet hold a photographed example of this type.
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
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class-C RF Power Amplifier or Oscillator | 6000 V | 20000 | — | 20 | 2080 mA |
| Class AB2 Audio (Two Tubes) | 6000 V | — | 4650 | 20 | 3000 mA |
| Class-C Telephony (Plate Modulated) | 5000 V | — | 1400 | 20 | 1450 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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