Tube-number record
6F8G
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6F8G is a tube type in the TubeDatabase archive (class: Twin Triode). Recorded specifications: brand Sylvania, construction Dual triode, socket Octal, maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassTwin Triode
BaseOctal
Filament6.3 V @ 600 mA
Construction
Primary TypeDual triode
EnvelopeST-12C
Sections2
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Amplificateur Classe A1 | 90 V | 3000 | 6700 | 20 | 10 mA |
| Amplificateur Classe A1 | 250 V | 2600 | 7700 | 20 | 9 mA |
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.
Datasheets
Datasheet: 6F8G.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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