Tube-number record
5GH8
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BrandTUNG-SOL
ClassTriode-Pentode
BaseNoval (B9A)
Filament4.7 V @ 0.6 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialSmall Button 9-Pin
Sections2
Filament / Heater
MaterialCoated Unipotential
Warm-up Time11s
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage350 V
Plate Dissipation2.5 W
Grid 2 Voltage430 V
Cathode Current20 mA
H-C Voltage200 V
Audio Performance
Key Features
- Sharp-cutoff pentode
- Medium-mu triode
- Separate cathodes
- Electrically independent sections
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 125 V | 7500 | 200000 | — | 12 mA |
| Triode Section | 125 V | 8500 | 5400 | 46 | 13.5 mA |
Application Notes
Pentode section intended primarily for service as an oscillator in horizontal deflection systems of television receivers.
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