Tube-number record
HL25
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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
Plate Dissipation4 W
Grid 1 Voltage-150 V
Cathode Current1 mA
H-C Voltage150 V
Audio Performance
Key Features
- Silicone coated clear glass
- High voltage control valve
- Voltage regulator application
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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