3CX20,000H3
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BrandEIMAC (Division of Varian)
ClassIndustrial Power Triode
BaseDirectly mounted via flexible leads
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
Base MaterialFlexible filament leads
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
- Ceramic insulated
- Medium-mu
- Thoriated tungsten filament
- Forced air cooling
- Low frequency to lower VHF range
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy / Industrial Oscillator (Set 1) | 7500V | - | - | - | 8000mA |
| Class C Telegraphy / Industrial Oscillator (Set 2) | 10000V | - | - | - | 7900mA |
| Class C Telephony (Plate Modulated) | 6500V | - | - | - | 5000mA |
| Audio Frequency Power Amplifier / Modulator (Two Tubes) | 7500V | - | - | - | 14800mA |
Application Notes
Specifically designed for industrial heating equipment (30 KHz to 90 MHz) and AM broadcast modulator or linear amplifier service. Features flexible filament leads for direct mounting without a socket.
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