25HP4
0 Tubes in archive
BrandNational Video Corporation
ClassCathode Ray Tube
BaseB7-208
Filament6.3V @ 450mA
Construction
Primary TypeCRT
EnvelopeJ-204-A1
SectionsSingle
Filament / Heater
MaterialOxide
Warm-up Time11s
Heater Notes450mA heater for 6.3V operation
Absolute Maximum Ratings
Plate Voltage23000 V
Grid 2 Voltage60 V
H-C Voltage200 V
Audio Performance
Key Features
- Filled Rim
- Straight gun (no ion trap)
- Aluminized Phosphor
- Electrostatic Focusing
- Magnetic Deflection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode Drive Service | 16000V | - | - | - | 0.1mA |
Application Notes
The 25HP4 is designed for cathode drive operation with a 50 volt G2. External conductive coating must be grounded.
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