Tube-number record
6U8-A
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BrandGeneral Electric
ClassTriode-Pentode
BaseNoval (B9A)
Filament6.3 V @ 450 mA
Construction
Primary TypeMulti-section
EnvelopeT-6 1/2
Base MaterialGlass
Sections2
Filament / Heater
Warm-up Time11s
Heater Notes0.45 Amperes
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- Sharp-cutoff pentode
- Medium-mu triode
- Separate cathodes
- Miniature tube
- Combined triode oscillator and pentode mixer
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 100 V | 5500 | — | — | — |
| Pentode Section | 125 V | 5000 | 200000 | — | 9.5 mA |
| Triode Section | 125 V | 7500 | 5300 | 40 | 13.5 mA |
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