Tube-number record
F-9C28
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BrandFederal
ClassPower Triode
Construction
Primary TypeTriode
EnvelopeGlass/Metal (Water-cooled)
Base MaterialMetal/Glass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation40000 W
Cathode Current45000 mA
Audio Performance
Power Output39000 W
Key Features
- Water-cooled anode
- Multi-strand thoriated tungsten filament
- Low mu modulator
- Class AB1 operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class AB1 Modulator (Two Tubes) | 10000 V | — | — | 4.75 | 7200 mA |
| Class AB1 Modulator (Two Tubes) | 12000 V | — | — | 4.75 | 5600 mA |
Application Notes
Federal’s F-9C28 is designed for use as a modulator in Class AB1 circuits. Anode is water-cooled, capable of dissipating 40 kilowatts.
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