Tube-number record
8954
0 archive entries
8954 is a tube type in the TubeDatabase archive (class: Voltage Regulator / Switch Tube). Recorded specifications: brand EIMAC, year 1974, construction Tetrode, socket Flexible / flying leads, maximum plate voltage 5500 V, and maximum plate dissipation 600 W. The archive does not yet hold a photographed example of this type.
BrandEIMAC
ClassVoltage Regulator / Switch Tube
BaseFlexible / flying leads
Filament6 V @ 5.6 mA
Construction
Primary TypeTetrode
EnvelopeCeramic/Metal
SectionsSingle
Filament / Heater
MaterialOxide Coated, Unipotential
Warm-up Time120s
Heater NotesVariations should be restricted to +/- 0.3V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pulse Modulator / Switch Tube | 5500 V | — | — | — | 8000 mA |
| Pure DC Service | 5500 V | — | — | — | 600 mA |
Application Notes
Designed for switch-tube or modulator and voltage regulator service. Rated for 5.5 kVdc in air or 7.5 kVdc in insulating oil. Cooling must maintain seals below 250°C.
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