Tube-number record
7844
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BrandRCA
ClassBeam Power Tube
BaseCoaxial
Filament6.3 V @ 2.1 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-Metal
SectionsSingle
Filament / Heater
Heater NotesUnipotential Cathode; 60 sec minimum heating time
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation180 W
Grid 2 Voltage300 V
Grid 1 Voltage-100 V
Cathode Current180 mA
Audio Performance
Power Output140 W
Key Features
- Ceramic-Metal Seals
- Coaxial-Electrode Structure
- Conduction Cooled
- Integral Conduction Cylinder
- High frequency operation up to 2000 Mc
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier Class AB1 (Push-Pull) | 850 V | — | — | 18 | 100 mA |
| AF Power Amplifier Class AB2 (Push-Pull) | 850 V | — | — | 18 | 177.5 mA |
| RF Power Amplifier Class C (1215 MHz) | 900 V | — | — | — |
Application Notes
The conduction cylinder must be thermally coupled to a heat sink. Heater voltage should be reduced at high frequencies due to cathode back-bombardment.
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