F-891
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BrandFederal
ClassPower Triode
Construction
Primary TypeTriode
EnvelopeGlass with water-cooled anode
SectionsSingle
Filament / Heater
MaterialPure Tungsten
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation6000 W
Grid 1 Voltage-3000 V
Cathode Current9 mA
Audio Performance
Power Output22000 W
Key Features
- Water-cooled anode
- Pure tungsten filament
- Vertical mounting
- Modulator, amplifier, and oscillator application
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio (Two Tubes) | 12500V | - | 12000 | 8.5 | 1.25mA |
| Class C Telegraphy | 10000V | - | - | 8.5 | 1.33mA |
Application Notes
Maximum ratings apply up to 1.6 megacycles, with operation up to 20 megacycles permissible at reduced ratings.
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