Tube-number record
3CW20,000H7
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BrandEIMAC
ClassPower Triode
BaseFlexible / flying leads
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
Base MaterialMetal/Ceramic
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage20000 V
Plate Dissipation20000 W
Grid 1 Voltage-230 V
Cathode Current7600 mA
Audio Performance
Key Features
- Water-cooled anode
- High-mu power triode
- Zero-bias Class B operation
- Ceramic/metal construction
- Thoriated tungsten filament
- High-voltage switch tube service
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Radio Frequency Linear Amplifier (Grounded Grid, Class B) | 7000 V | — | — | 200 | 3720 mA |
| Audio Frequency Amplifier (Two Tubes, Class B) | 7000 V | — | — | 200 | 10000 mA |
| Radio Frequency Power Amplifier (Class C) | 7000 V | — | — |
Application Notes
Anode cooling is achieved by circulating water through the integral jacket. Base requires forced-air cooling (30-50 cfm). Tube must be operated vertically, anode up or down. Filament voltage should be measured at terminals with 1 percent accuracy.
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