Tube-number record
9C21
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BrandRCA
ClassPower Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass/Metal
Base MaterialMetal
Sections1
Filament / Heater
MaterialMultistrand Tungsten
Absolute Maximum Ratings
Plate Voltage17000 V
Plate Dissipation40000 W
Grid 1 Voltage-2000 V
Cathode Current9000 mA
Audio Performance
Power Output30500 W
Key Features
- Water-cooled plate
- Forced-air cooled seals
- Multistrand tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier & Oscillator - Class C Telegraphy | 17000 V | — | — | 40 | 7900 mA |
| AF Power Amplifier & Modulator - Class B (Per Tube) | 14000 V | — | — | 40 | 3700 mA |
Application Notes
The water flow must start before the application of any voltages and continue for at least 2 minutes after removal.
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