Tube-number record
8940
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BrandEIMAC (Varian)
ClassPlanar Triode
BasePlanar / disc seal
Filament6.3 V @ 2.25 mA
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesOxide Coated, Unipotential
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation750 W
Grid 1 Voltage-200 V
Cathode Current16000 mA
Audio Performance
Key Features
- Arc-resistant cathode
- Vaporization shield
- Rugged ceramic/metal design
- Liquid cooling compatible
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average | — | 100000 | — | 65 | 160 mA |
| Cut-off | 1000 V | — | — | — | 1 mA |
Application Notes
The 8940 is designed for advanced airborne, ground, and space applications up to 2.5 GHz. It can operate as an amplifier, oscillator, or frequency multiplier in CW or pulsed modes.
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