F-9C31
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BrandFederal
ClassPower Triode
Construction
Primary TypeTriode
EnvelopeGlass/Forced-Air-Cooled Anode
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation20000 W
Grid 1 Voltage-3000 V
Cathode Current45000 mA
Audio Performance
Power Output39000 W
Key Features
- Forced-air-cooled anode
- Thoriated tungsten multi-strand filament
- High dissipation capacity
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio Power Amplifier | 10000V | - | - | 40.5 | 6000mA |
| Plate-Modulated Class C Telephony | 12000V | - | - | - | 3080mA |
| Class C Telegraphy | 15000V | - | - | - | 4700mA |
Application Notes
Maximum ratings apply up to 20 megacycles. Filament may be operated on DC, single-phase, three-phase, or six-phase AC excitation.
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