9C26
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BrandRCA
ClassPower Triode
BaseSpecial
Construction
Primary TypeTriode
EnvelopeIntegral Radiator
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialMultistrand Thoriated Tungsten
Absolute Maximum Ratings
Plate Voltage11500 V
Plate Dissipation7500 W
Grid 1 Voltage-2000 V
Cathode Current2500 mA
Audio Performance
Power Output25000 W
Key Features
- Forced-air-cooled
- Grounded-grid type
- Thoriated tungsten filament
- Integral radiator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier & Modulator—Class B (Values for 2 tubes) | 8000V | - | - | 32 | 4500mA |
| RF Power Amplifier Class B Telephony (Grounded-Filament) | 7500V | - | - | - | 1500mA |
| Plate-Modulated RF Power Amplifier Class C Telephony (Grounded-Filament) | 7500V | - | - | - | 1700mA |
| RF Power Amplifier & Oscillator Class C Telegraphy (Grounded-Filament) | 7500V | - | - | - | 1600mA |
Application Notes
The filament current should never exceed 425 amperes, even momentarily. Mounting position must be vertical with filament end up.
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