25QP20
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BrandTESLA
ClassCathode Ray Tube (CRT)
BaseLoctal 8-pin
Filament6.3V @ 600mA
Construction
Primary TypePentode CRT with Ion Trap
EnvelopeGlass
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialOxide
Warm-up Time40s
Heater NotesIndirectly heated, AC or DC
Absolute Maximum Ratings
Plate Voltage10000 V
Grid 1 Voltage-150 V
Cathode Current0.05 mA
H-C Voltage125 V
Audio Performance
Key Features
- Magnetic deflection
- Magnetic focusing
- Ion trap
- Smoked glass faceplate
- Spherical faceplate
- White phosphor
- Medium persistence
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| 6kV Operation | 6000V | - | - | - | - |
| 8kV Operation | 8000V | - | - | - | - |
Application Notes
Television CRT; outer surface of cone is covered with a conductive graphite layer and must always be grounded in operation. Recommend horizontal mounting position.
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