Tube-number record
25HP4
0 archive entries
25HP4 is a tube type in the TubeDatabase archive (class: Cathode Ray Tube). Recorded specifications: brand National Video Corporation, construction Display / CRT, socket CRT base (B7 family), and maximum plate voltage 23000 V. The archive does not yet hold a photographed example of this type.
BrandNational Video Corporation
ClassCathode Ray Tube
BaseCRT base (B7 family)
Filament6.3 V @ 450 mA
Construction
Primary TypeDisplay / CRT
EnvelopeJ-204-A1
SectionsSingle
Filament / Heater
MaterialOxide
Warm-up Time11s
Heater Notes450mA heater for 6.3V operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode Drive Service | 16000 V | — | — | — | 0.1 mA |
Application Notes
The 25HP4 is designed for cathode drive operation with a 50 volt G2. External conductive coating must be grounded.
Datasheets
Datasheet: 25HP4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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