Tube-number record
25DP4/25EP4
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BrandSylvania
ClassTelevision Picture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
EnvelopeRectangular Glass
SectionsMonochrome
Filament / Heater
Heater NotesWarm-up time 14 seconds
Absolute Maximum Ratings
Plate Voltage22000 V
Grid 2 Voltage700 V
Grid 1 Voltage-155 V
H-C Voltage200 V
Audio Performance
Key Features
- Electrostatic Focusing
- Magnetic Deflection
- Aluminized Screen
- No Ion Trap
- External Conductive Coating
- Gray Filter Glass
- Bonded Frame
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid Drive Service | 16000 V | — | — | — | — |
| Cathode Drive Service | 16000 V | — | — | — | — |
Application Notes
X-ray radiation shielding may be necessary if tube is operated at higher than 16,000 volts. Visual extinction of focused raster occurs between -35 to -72V for Grid Drive.
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