Tube-number record
HFI 490
0 archive entries
HFI 490 is a tube type in the TubeDatabase archive (class: Industrial HF Power Triode). Recorded specifications: brand CSF (Compagnie Générale de Télégraphie Sans Fil), year 1959, construction Triode, maximum plate voltage 10000 V, and maximum plate dissipation 6000 W. The archive does not yet hold a photographed example of this type.
BrandCSF (Compagnie Générale de Télégraphie Sans Fil)
ClassIndustrial HF Power Triode
Construction
Primary TypeTriode
EnvelopeGlass and Metal
Sections1
Filament / Heater
MaterialThoriated Tungsten
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage10000 V
Plate Dissipation6000 W
Grid 1 Voltage-2000 V
Cathode Current3500 mA
Audio Performance
Key Features
- Forced air cooling
- Thoriated tungsten filament
- Rugged grid structure
- Designed for dielectric heating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Characteristics | 5000 V | 15000 | 833 | 12.5 | 1200 mA |
| HF Industrial Heating (30MHz) | 6000 V | 15000 | — | — | 3200 mA |
Application Notes
Anode must be mounted vertically with the anode at the bottom. Airflow should be established before filament power is applied. Max seal temperature 180°C.
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