Tube-number record
7457
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BrandRCA
ClassBeam Power Tube
BaseCoaxial
Filament6.3 V @ 3200 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-metal seals
Base MaterialCeramic-Metal
Sections1
Filament / Heater
Heater NotesMatrix-Type, Oxide-Coated, Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation115 W
Grid 2 Voltage300 V
Grid 1 Voltage-100 V
Cathode Current180 mA
Audio Performance
Power Output85 W
Key Features
- Ceramic-metal seals
- Coaxial-electrode structure
- Integral radiator
- One-piece electrode design
- Shock and vibration resistant
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier Class AB1 (2 tubes) | 850 V | — | 7000 | 18 | 200 mA |
| RF Power Amplifier Class C Telegraphy (1215 Mc/s) | 900 V | — | — | 18 | 170 mA |
Application Notes
For use at frequencies up to 2000 Mc/s under severe shock and vibration. Forced-air cooling is required to limit radiator core to 250 degrees C.
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