A 47-17 W
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BrandTelefunken
ClassTV-picture tube
Base7-pin Special (Jetec B7-208)
Filament6.3V @ 300mA
Construction
Primary TypeCathode Ray Tube (CRT)
EnvelopeRectangular All-glass
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesIndirectly heated, controlled warming-up time, suitable for parallel or series supply.
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage550 V
Grid 1 Voltage-150 V
H-C Voltage200 V
Audio Performance
Key Features
- Without ion trap
- Grey glass
- Metal-backed screen
- Metal shielding including tube mount
- Low-voltage focus
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Operation | 16000V | - | - | - | - |
Application Notes
The tube can be used without a protective safety plate. Focus voltage ranges from 0 to 400V for general sharpness.
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