Tube-number record
803
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BrandRCA
ClassR-F Power Amplifier Pentode
Base5-pin
Construction
Primary TypePentode
EnvelopeT-20
Base MaterialMicanol
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage2000 V
Plate Dissipation125 W
Grid 2 Voltage600 V
Grid 1 Voltage-500 V
Cathode Current175 mA
Audio Performance
Key Features
- Thoriated Tungsten Filament
- Suppressor-Modulated
- Grid-Modulated
- Plate-Modulated
- Pentode and Tetrode connection modes
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R-F Power Amplifier - Class B Telephony | 2000 V | 4000 | — | — | 80 mA |
| R-F Power Amplifier & Oscillator - Class C Telegraphy | 2000 V | 4000 | — | — | 160 mA |
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