Tube-number record
A 31-20 W
0 archive entries
BrandTELEFUNKEN
ClassTV-picture tube
BaseMiniature 7-pin (B7G)
Filament11 V @ 68 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGrey glass
Base MaterialGlass
SectionsSingle-gun
Filament / Heater
MaterialIndirectly heated
Heater NotesLow power (0.75 W)
Absolute Maximum Ratings
Plate Voltage12000 V
Grid 2 Voltage350 V
H-C Voltage110 V
Audio Performance
Key Features
- Rectangular faceplate
- Spherical faceplate shape
- 90 degree magnetic deflection
- Electrostatic focus
- Grey glass screen
- Metal-backed screen
- No safety plate required
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode drive | 11000 V | — | — | — | — |
Application Notes
Television picture tube intended for battery or line operation. Cathode drive operation is typical. Heater current of 68 mA is suitable for 11V power supplies.
Datasheets
Datasheet: A31-20W.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
0 results