F-7C25
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BrandFederal Telephone and Radio Company
ClassPower Triode
FilamentV @ mA
Construction
Primary TypeTriode
EnvelopeGlass/Metal
Sections1
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage5000 V
Plate Dissipation2500 W
Grid 1 Voltage-1500 V
Audio Performance
Key Features
- Wide spacing between elements
- No internal insulators
- Air-cooled anode
- Industrial application suitability
- Thoriated tungsten cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier Class C Telegraphy (1) | 4000V | - | - | 25 | 1000mA |
| RF Power Amplifier Class C Telegraphy (2) | 4500V | - | - | 25 | 1200mA |
| RF Power Amplifier Class C Telegraphy (3) | 5000V | - | - | 25 | 1200mA |
| Plate-Modulated RF Power Amplifier Class C Telephony | 3500V | - | - | 25 | 825mA |
Application Notes
Designed for use in industrial applications meeting severe conditions of radio frequency heating service. Maximum ratings apply up to 30 megacycles.
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