HL-D
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BrandFerranti
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialBakelite
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation1.5 W
Grid 1 Voltage-10 V
Audio Performance
Key Features
- High-Mu
- Battery-Type
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 150V | 1550 | 18000 | 28 | 3mA |
Application Notes
Used primarily in early radio receiver amplification stages.
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