Tube-number record
7801
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BrandRCA
ClassBeam Power Tube
BaseCoaxial
Filament12.6 V @ 500 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesUnipotential Cathode; 40 sec minimum heating time
Absolute Maximum Ratings
Plate Voltage750 V
Grid 2 Voltage250 V
Grid 1 Voltage-100 V
Cathode Current70 mA
Audio Performance
Key Features
- Ceramic-Metal Seals
- One-Piece Electrode Design
- Conduction Cooled
- Coaxial-Electrode Structure
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier - Class C | 650 V | 7500 | — | 30 | 65 mA |
| Class C Plate-Modulated | 600 V | — | — | — | 50 mA |
Application Notes
The plate terminal must be thermally coupled to a constant temperature device (heat sink) to limit terminal temperature to 250 C.
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