6F8G
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BrandSylvania
ClassTwin Triode
BaseOctal
Filament6.3V @ 600mA
Construction
Primary TypeDouble Triode
EnvelopeST-12C
Sections2
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Audio Performance
Key Features
- Twin triodes
- Essentially two 6J5G types in one envelope
- Grid of one section connected to top cap
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Amplificateur Classe A1 | 90V | 3000 | 6700 | 20 | 10mA |
| Amplificateur Classe A1 | 250V | 2600 | 7700 | 20 | 9mA |
Application Notes
The Sylvania type 6F8G consists of two 6J5G types in the same bulb. Heater-to-cathode voltage should be kept as low as possible. Recommended for use in ventilated areas due to higher operating temperatures. For cascade amplifiers, the section with the top-cap grid connection is recommended for the first stage to reduce hum.
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