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

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7F7 vacuum tube outline illustration

Tube-number record

7F7

0 archive entries

7F7 is a tube type in the TubeDatabase archive (class: High-Mu Duo Triode). Recorded specifications: brand Sylvania, construction Triode, socket Loctal, maximum plate voltage 300 V, and maximum plate dissipation 1 W. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassHigh-Mu Duo Triode
BaseLoctal
Filament7 V @ 0.32 mA

Construction

Primary TypeTriode
EnvelopeT9
SectionsDuo

Filament / Heater

Heater NotesTypical Operation also lists 6.3V @ 0.3A

Absolute Maximum Ratings

Plate Voltage300 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier Per Section100 V112562000700.65 mA
Class A Amplifier Per Section250 V160044000702.3 mA

Application Notes

Designed for use as a resistance coupled amplifier or phase inverter. All elements except the common heater are brought out separately allowing each triode section to operate independently.

Datasheets

Datasheet: 7F7.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 Dissipation1 W
    H-C Voltage90 V

    Audio Performance

    Key Features
    • High-mu duo triode
    • Lock-In construction
    • GT Equivalent 6SL7GT