Tube-number record
TH 308
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TH 308 is a tube type in the TubeDatabase archive (class: High Gain Triode). Recorded specifications: brand Thomson-CSF, construction Triode, socket Coaxial, maximum plate voltage 2200 V, and maximum plate dissipation 700 W. The archive does not yet hold a photographed example of this type.
BrandThomson-CSF
ClassHigh Gain Triode
BaseCoaxial
Filament6.3 V @ 5500 mA
Construction
Primary TypeTriode
EnvelopeCeramic Metal
SectionsSingle
Filament / Heater
MaterialOxide coated
Warm-up Time3s
Heater NotesIndirectly heated. 6.3V nominal; reduced to 5.7V for high frequency operation to compensate for back bombardment.
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Linear TV Translator (Vision and Sound) | 1800 V | 45000 | 1777.78 | 80 | 200 mA |
Application Notes
Specifically designed for highly linear amplifier operating up to 1000 MHz without grid current in TV translators handling both sound and vision signals.
Datasheets
Datasheet: TH308.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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