Tube-number record
7904
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BrandWestinghouse
ClassIonization Gauge Tube
Construction
Primary TypeOther / special
EnvelopeHard glass bulb with 0.5 inch Pyrex tubulation
SectionsTriode with three tungsten filaments
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation30 W
Grid 1 Voltage-100 V
Audio Performance
Key Features
- Inverted geometry design
- Three tungsten filaments (can be operated one at a time, series, or parallel)
- Hard glass bulb
- Pyrex tubulation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 150 V | — | — | — | 10 mA |
Application Notes
The ratio of the collector current to the grid current is proportional to the gas pressure. Outgassing is accomplished by connecting grid and collector together and passing a high current through the tube.
Datasheets
Datasheet: 7904.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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