Tube-number record
HOT FILAMENT IONIZATION GAUGE
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HOT FILAMENT IONIZATION GAUGE is a tube type in the TubeDatabase archive (class: Special Purpose Electronic Tubes). Recorded specifications: brand Sylvania, year 1963, construction Other / special, base Glass-to-metal seal / ground joint options, socket Flexible / flying leads, and maximum plate voltage -25 V. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassSpecial Purpose Electronic Tubes
BaseFlexible / flying leads
Construction
Primary TypeOther / special
EnvelopePyrex Glass
Base MaterialGlass-to-metal seal / ground joint options
SectionsTriode (Filament, Grid, Collector)
Filament / Heater
MaterialHot filament
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Ionization Gauge Operation | -25 V | — | — | — | — |
Application Notes
The hot filament ionization gauge measures vacuum pressures below 1x10-3 mm mercury. Electrons accelerated toward the grid collide with gas molecules to produce ions collected on the negative collector. Sensitivity is linear and directly proportional to grid current.
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