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Tube Database (7,341 tube types · 1,270 archive entries)

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7F8 vacuum tube outline illustration

Tube-number record

7F8

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7F8 is a tube type in the TubeDatabase archive (class: Twin Triode). Recorded specifications: brand General Electric, construction Triode, socket Loctal, maximum plate voltage 250 V, and maximum plate dissipation 3.5 W. The archive does not yet hold a photographed example of this type.

BrandGeneral Electric
ClassTwin Triode
BaseLoctal
Filament6.3 V @ 300 mA

Construction

Primary TypeTriode
EnvelopeT-9 Glass
SectionsTwin

Filament / Heater

Heater NotesCoated Unipotential Cathode

Absolute Maximum Ratings

Plate Voltage250 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier (Each Section)150 V4300113004810 mA

Application Notes

The 7F8 is designed for use as a grounded-grid radio-frequency amplifier or as a frequency converter at frequencies up to 300 megacycles. Cathode-bias resistor for typical operation is 500 Ohms. D-C resistance in the grid circuit should not exceed 0.5 megohm.

Datasheets

Datasheet: 7F8.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

Filters

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Manufacturers

Brands

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    Plate Dissipation3.5 W
    H-C Voltage90 V

    Audio Performance

    Key Features
    • Grounded-grid radio-frequency amplifier
    • Frequency converter
    • Operation up to 300 megacycles