Tube-number record
F 4025
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BrandCSF
ClassTraveling Wave Tube
BaseSpecial / none
Filament6.3 V @ 450 mA
Construction
Primary TypeOther / special
EnvelopeMetal-Ceramic
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialOxide
Warm-up Time180s
Heater NotesIndirect heating
Absolute Maximum Ratings
Plate Voltage800 V
Grid 2 Voltage150 V
Grid 1 Voltage-100 V
Cathode Current1 mA
Audio Performance
Key Features
- Wide bandwidth
- High gain
- Medium noise
- Metal-ceramic structure
- Airborne and military grade
- Permanent magnet focusing
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical at 5.5 GHz | 700 V | — | — | — | 1 mA |
Application Notes
Used in high-frequency wideband receivers to improve signal-to-noise ratio. Designed for shock, vibration, and temperature resistance.
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