A28-13W
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BrandTELEFUNKEN
ClassTelevision Picture Tube
BasePico 7 (modified)
Construction
Primary TypeMonochrome CRT
EnvelopeGlass
Base MaterialGlass
Sections1
Filament / Heater
Heater Notes0.75 W filament power, indirectly heated
Absolute Maximum Ratings
Plate Voltage12000 V
Grid 2 Voltage550 V
Grid 1 Voltage-150 V
H-C Voltage200 V
Audio Performance
Key Features
- Rectangular faceplate
- 90 degree magnetic deflection
- Electrostatic focusing
- Metal-backed screen
- Grey glass
- 20 mm neck diameter
- No ion trap required
- Metal shielding included
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical TV Operation | 10000V | - | - | - | - |
Application Notes
The tube requires a black coating thickness sufficient to meet the 100 Ohm resistance requirement. Focusing voltage is typically -50 to +250 V at an anode current of 0.25 mA.
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