Tube-number record
31C81
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31C81 is a tube type in the TubeDatabase archive (class: Cathode Ray Tube). Recorded specifications: brand EDISWAN, construction Display / CRT, socket Diheptal, and maximum plate voltage 8000 V. The archive does not yet hold a photographed example of this type.
BrandEDISWAN
ClassCathode Ray Tube
BaseDiheptal
Filament6.3 V @ 500 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle Gun
Filament / Heater
Heater NotesHeater 100V Negative with respect to cathode
Absolute Maximum Ratings
Plate Voltage8000 V
Grid 2 Voltage2000 V
Grid 1 Voltage-200 V
H-C Voltage150 V
Audio Performance
Key Features
- Post Deflection Acceleration
- Flat screen
- High Precision Instruments
- All Electrostatic
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 4000 V | — | — | — | 0.002 mA |
Application Notes
The magnetic shield should be of high permeability material and earthed. For direct measurement of deflection amplitudes, Va4/Va3 ratio should not exceed 2:1.
Datasheets
Datasheet: 31C81.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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