Tube-number record
HL25
0 archive entries
HL25 is a tube type in the TubeDatabase archive (class: High Voltage Control Triode). Recorded specifications: brand Ferranti, year 1963, construction Triode, socket Octal, maximum plate voltage 15000 V, and maximum plate dissipation 4 W. The archive does not yet hold a photographed example of this type.
BrandFerranti
ClassHigh Voltage Control Triode
BaseOctal
Filament4 V @ 1000 mA
Construction
Primary TypeTriode
EnvelopeSilicone coated clear glass
Sections1
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage15000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cut-off | 15000 V | — | — | — | — |
| la = 5uA | 15000 V | — | — | — | 0.005 mA |
Application Notes
The high voltages normally applied to this valve can be very dangerous. Particular care should be taken when making circuit adjustments.
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