Tube-number record
25 QP 21
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25 QP 21 is a tube type in the TubeDatabase archive (class: Cathode Ray Tube). Recorded specifications: brand TESLA, construction Display / CRT, base Glass/Metal, socket 8-pin, and maximum plate voltage 10000 V. The archive does not yet hold a photographed example of this type.
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
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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