9C25
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BrandRCA
ClassPower Triode
BaseSpecial
Construction
Primary TypeTriode
EnvelopeForced-Air Cooled Metal-Glass
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage11500 V
Plate Dissipation17500 W
Grid 1 Voltage-2000 V
Cathode Current4000 mA
Audio Performance
Power Output50000 W
Key Features
- Forced-air cooled
- Grounded-grid type
- Flanged-header grid terminal
- Multistrand thoriated tungsten filament
- External radiator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier & Modulator - Class B (2 tubes) | 10500V | - | - | 32 | 3500mA |
| RF Power Amplifier - Class B Telephony (Grounded-Filament) | 10000V | - | - | 32 | 2050mA |
| RF Power Amplifier & Oscillator - Class C Telegraphy | 11000V | - | - | 32 | 3600mA |
Application Notes
Designed for communication and industrial service. Effectively isolates the filament from the plate circuit in grounded-grid circuits, generally making neutralization unnecessary.
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