Tube-number record
5U8
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BrandTung-Sol
ClassTriode Pentode
BaseNoval (B9A)
Filament4.7 V @ 600 mA
Construction
Primary TypeMulti-section
EnvelopeT-6.5
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesHeater-Cathode Unipotential
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- Coated Unipotential Cathode
- Any Mounting Position
- Miniature Button 9-Pin Base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section Class A1 | 125 V | 7500 | — | 40 | 13.5 mA |
| Pentode Section Class A1 | 125 V | 5000 | 200000 | — | 9.5 mA |
Application Notes
Specifically designed for local oscillator-pentode mixer applications in FM or TV receivers.
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