Tube-number record
31B81
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31B81 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 @ 0.5 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle gun
Filament / Heater
Heater NotesHeater 100V negative to cathode
Absolute Maximum Ratings
Plate Voltage8000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 4000 V | — | — | — | 0.002 mA |
Application Notes
The undeflected spot will fall within a circle of 5 mm radius from the centre of the tube face. Orthogonality of deflection axes is +/- 1%. The magnetic shield should be of high permeability material and earthed.
Datasheets
Datasheet: 31B81.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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