Tube-number record
3CX20,000A3
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BrandEIMAC (Varian)
ClassIndustrial Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
Base MaterialCoaxial
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage12000 V
Plate Dissipation20000 W
Grid 1 Voltage-2000 V
Cathode Current8000 mA
Audio Performance
Key Features
- Medium-Mu industrial triode
- Ceramic insulated
- Forced-air cooling
- Thoriated tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Linear Amplifier Class AB2 | 7500 V | — | — | — | 7400 mA |
| RF Power Amplifier Class C Telegraphy | 10000 V | — | — | — | 7900 mA |
| Plate Modulated RF Power Amplifier Class C | 6500 V | — | — | — |
Application Notes
Recommended for Class C amplifier service, or Class B radio frequency and audio frequency amplifier use. Forced air cooling required (base-to-anode direction).
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