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

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9AK8 vacuum tube outline illustration

Tube-number record

9AK8

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9AK8 is a tube type in the TubeDatabase archive (class: Triple Diode Triode). Recorded specifications: brand Rogers Majestic Electronics Ltd., construction Multi-section, base Small button noval 9-pin, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 1 W. The archive does not yet hold a photographed example of this type.

BrandRogers Majestic Electronics Ltd.
ClassTriple Diode Triode
BaseNoval (B9A)
Filament9.5 V @ 300 mA

Construction

Primary TypeMulti-section
EnvelopeGlass
Base MaterialSmall button noval 9-pin
Sections4 (3 diodes + 1 triode)

Filament / Heater

Heater Notes9.5V 300mA series heater string

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Triode Section100 V130054000790.8 mA
Triode Section170 V130054000701 mA
Triode Section200 V125056000701 mA

Datasheets

Datasheet: 9AK8.pdf

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

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Manufacturers

Brands

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    Plate Voltage250 V
    Plate Dissipation1 W
    Grid 1 Voltage-1.3 V
    Cathode Current5 mA
    H-C Voltage150 V

    Audio Performance

    Key Features
    • Triple diode triode structure
    • Designed for video and audio signal detection
    • Series heater string application
    • Low microphonic triode
    Triode Section250 V120058000701 mA