Tube-number record
HL-D
0 archive entries
HL-D is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Ferranti, construction Triode, base Bakelite, socket 4-pin, maximum plate voltage 200 V, and maximum plate dissipation 1.5 W. The archive does not yet hold a photographed example of this type.
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 | 150 V | 1550 | 18000 | 28 | 3 mA |
Application Notes
Used primarily in early radio receiver amplification stages.
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