Tube-number record
F4025B
0 archive entries
F4025B is a tube type in the TubeDatabase archive (class: Traveling Wave Tube). Recorded specifications: brand THOMSON-CSF, construction Other / special, base Metal, socket Special / none, maximum plate voltage 900 V, and maximum plate dissipation 0.1 W. The archive does not yet hold a photographed example of this type.
BrandTHOMSON-CSF
ClassTraveling Wave Tube
BaseSpecial / none
Filament6.3 V @ 0.4 mA
Construction
Primary TypeOther / special
EnvelopeCeramic and Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
Warm-up Time120s
Heater NotesRegulated heater supply recommended.
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation at 5.7 GHz | 850 V | — | — | — | 0.9 mA |
Application Notes
The tube helix should be connected to ground by means of a DC short or a crystal rectifier after installation. Pre-heat for two minutes before applying high voltage.
Datasheets
Datasheet: F4025B.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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