8057
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BrandWestinghouse
ClassIonization Vacuum Gauge Tube
Construction
Primary TypeBayard-Alpert Triode
EnvelopeNonex (Corning Code 7720)
SectionsSingle section with dual filaments
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Grid 1 Voltage500 V
Audio Performance
Key Features
- Bayard-Alpert electrode structure
- Minimum metal surface for ease of out-gassing
- Two tungsten filaments
- Non-sag tungsten helical grid
- Hard glass bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | -30V | - | - | - | - |
Application Notes
The 8057 is an ionization type of vacuum-gauge tube for measurement of gas pressure as low as 10^-9 mm of mercury. Electrons are accelerated from the filament to the grid; they bombard and ionize gas molecules, and the resultant positive ions are attracted to the collector. The ratio of the collector current to the grid current is proportional to the gas pressure.
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