Tube-number record
8940
0 archive entries
8940 is a tube type in the TubeDatabase archive (class: Planar Triode). Recorded specifications: brand EIMAC (Varian), year 1975, construction Triode, base Metal, socket Planar / disc seal, maximum plate voltage 4000 V, and maximum plate dissipation 750 W. The archive does not yet hold a photographed example of this type.
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
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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