9C27
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BrandRCA
ClassPower Triode
BaseSpecial Water Jacket
Construction
Primary TypeTriode
EnvelopeMetal-Glass
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage11500 V
Plate Dissipation25000 W
Grid 1 Voltage-2000 V
Cathode Current4000 mA
Audio Performance
Power Output50000 W
Key Features
- Water-cooled
- Forced-air-cooled
- Grounded-grid type
- Thoriated-tungsten filament
- Conical grid support
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier & Modulator--Class B (Per Tube) | 10500V | - | - | 32 | 3500mA |
| RF Power Amplifier--Class B Telephony (Grounded-Filament) | 10000V | - | - | 32 | 2050mA |
| RF Power Amplifier & Oscillator--Class C Telegraphy (Grounded-Filament) | 11000V | - | - | 32 | 3600mA |
Application Notes
The water flow must start before the application of any voltages and continue for at least 2 minutes after removal. The flanged-header grid terminal isolates the filament from the plate circuit in grounded-grid circuits, generally making neutralization unnecessary.
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