6578
0 Tubes in archive
BrandVacuum Tube Products
ClassIonization Gauge Tube
BaseRETMA 7EH
Construction
Primary TypeIonization Gauge
EnvelopeCeramic
Base MaterialCeramic RETMA A7.14
SectionsTriode-like (Grid/Collector)
Filament / Heater
MaterialPure Metal
Absolute Maximum Ratings
Plate Voltage500 V
Grid 1 Voltage-500 V
Cathode Current15 mA
Audio Performance
Key Features
- Three separately connected filaments
- Provision for outgassing the grid by direct heating
- Reliable measurement of low pressures
- Collector is physically small to minimize bombardment release errors
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Ionization Gauge Operation | 150V | - | - | - | 5mA |
Application Notes
Used for measuring vacuum in large metal systems. Filaments should be used individually for maximum life. Grid outgassing may be done while the tube is in operation.
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