Tube-number record
56006
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BrandPhilips
ClassMass-spectrometer tube
BaseB9G (EF50)
Construction
Primary TypeOther / special
EnvelopeFernico sealing glass
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage-90 V
Grid 2 Voltage40 V
Grid 1 Voltage-80 V
Cathode Current3500 mA
Audio Performance
Key Features
- Platinum electrodes
- Tungsten cathode
- Separates masses 32 and 33
- Measurement at partial pressures of 10^-11 to 10^-5 torr
- Baking temperature up to 450°C
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Gas Analysis | -90 V | — | — | — | 0.03 mA |
Application Notes
Filament is insensitive to air at room temperature when cold but operation at pressures above 10^-5 torr will cause damage. Requires permanent magnet with 0.45 Wb/m2 induction.
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