Tube-number record
HIGH PRESSURE IONIZATION GAUGE
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BrandWestinghouse
ClassVacuum Measurement Tube
Base10-pin
Construction
Primary TypeTriode
EnvelopePyrex (Corning Code 7740)
SectionsSingle
Filament / Heater
MaterialThoria Coated Iridium (Operate), Tungsten Ribbon (Outgas)
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation12 W
Grid 2 Voltage65 V
Grid 1 Voltage-65 V
Audio Performance
Key Features
- Thoria coated iridium wire filament
- Filament burnout protection against accidental air exposure
- Flat plate ion collector
- Tungsten ribbon electron collector/emitter
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation (1x10-4 to 1x10-2 mm Hg) | -60 V | — | — | — | 1 mA |
| Operation (1x10-6 to 1x10-4 mm Hg) | -60 V | — | — | — | 0.05 mA |
Application Notes
Circuitry consists of 60V DC power supplies for collecting electrodes and a variable filament supply. Filament power required is 1.3V-2V at 2.4A-2.5A for operation and 3.6V-5.5V at 13A for outgassing.
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