Tube-number record
5JD8
0 archive entries
5JD8 is a tube type in the TubeDatabase archive (class: Triode-Pentode). Recorded specifications: construction Multi-section, socket Noval (B9A), maximum plate voltage 330 V, and maximum plate dissipation 3.1 W. The archive does not yet hold a photographed example of this type.
ClassTriode-Pentode
BaseNoval (B9A)
Filament4.7 V @ 0.6 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesControlled heater warm-up time
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3.1 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- High-mu triode
- Sharp-cutoff pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 125 V | 10500 | 100000 | — | 12 mA |
| Triode Section | 125 V | 8500 | 5400 | 46 | 13.5 mA |
Application Notes
Designed for use in television receivers as a combined triode oscillator and pentode mixer.
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