827-R
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BrandRCA
ClassBeam Power Tube
BaseCustom (Radiator plate, ribbon leads)
FilamentV @ mA
Construction
Primary TypeBeam Power Tube
EnvelopeGlass with integral radiator
Base MaterialSealed metal header
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage3500 V
Plate Dissipation800 W
Grid 2 Voltage1000 V
Grid 1 Voltage-500 V
Cathode Current500 mA
Audio Performance
Key Features
- Forced-air cooled
- Thoriated tungsten filament
- Integral radiator
- Beam power tube structure
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier - Class B Telephony | 3500V | - | - | 16 | 340mA |
| RF Power Amplifier & Oscillator - Class C Telegraphy | 3500V | - | - | 16 | 428mA |
Application Notes
Useful with full input up to 110 Mc. Operating position: Vertical, filament end up. Forced-air cooling required before and during voltage application.
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