Tube-number record
F-891-R
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BrandFederal Telephone and Radio Corporation
ClassPower Triode
Construction
Primary TypeTriode
EnvelopeForced-air-cooled anode
Sections1
Filament / Heater
MaterialPure tungsten
Absolute Maximum Ratings
Plate Voltage10000 V
Plate Dissipation4000 W
Grid 1 Voltage-3000 V
Cathode Current9000 mA
Audio Performance
Power Output10000 W
Key Features
- Forced-air-cooled
- Pure tungsten filament
- Operation from single-phase, two-phase AC or DC
- Maximum ratings up to 1.6 MHz
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio-Frequency Power Amplifier and Modulator | 8000 V | — | — | 8.5 | 2100 mA |
| Class C Radio-Frequency Power Amplifier and Oscillator | 10000 V | — | — | 8.5 | 1330 mA |
Application Notes
Permissible operation up to 20 megacycles at reduced ratings. Vertical mounting position, anode down.
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