Tube-number record
25 QP 21
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BrandTESLA
ClassCathode Ray Tube
Base8-pin
Filament6.3 V @ 700 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialGlass/Metal
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated, oxide cathode, AC or DC
Absolute Maximum Ratings
Plate Voltage10000 V
Grid 2 Voltage400 V
Grid 1 Voltage150 V
Cathode Current0.05 mA
H-C Voltage125 V
Audio Performance
Key Features
- Electromagnetic deflection
- Magnetic focusing
- Long persistence screen
- Conductive outer coating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation 1 | 6000 V | — | — | — | — |
| Operation 2 | 8000 V | — | — | — | — |
Application Notes
Designed for measuring and industrial instruments requiring long afterglow. Outer conductive coating must be grounded.
Datasheets
Datasheet: 25QP21.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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