Tube-number record
GR 31
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ClassCold Cathode Relay Tube
BaseNoval (B9A)
Construction
Primary TypeTriode
EnvelopeGlass
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage350 V
Grid 1 Voltage140 V
Cathode Current40 mA
Audio Performance
Key Features
- Cold molybdenum cathode
- Low Tritium preionization
- DC-Triode
- Independent of illumination
- Positive starter operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| DC Operation | 300 V | — | 12000 | — | 15 mA |
Application Notes
Used for control by photoelectric cells, ionisation chambers, sensitive contacts, electronic timers, and counting circuits. Resistor RH must be soldered directly to the tube socket.
Datasheets
Datasheet: GR31.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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