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

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8KR8 vacuum tube outline illustration

Tube-number record

8KR8

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8KR8 is a tube type in the TubeDatabase archive (class: Receiving Tube). Recorded specifications: brand Sylvania, construction Multi-section, base Glass, socket Noval (B9A), maximum plate voltage 330 V, and maximum plate dissipation 5 W. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassReceiving Tube
BaseNoval (B9A)
Filament8 V @ 600 mA

Construction

Primary TypeMulti-section
EnvelopeT-6 1/2
Base MaterialGlass
Sections2

Filament / Heater

Heater NotesSeries circuit operation

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Triode Section125 V1040044004615 mA
Pentode Section (Low Voltage)35 V———54 mA
Pentode Section200 V2000060000—19.5 mA

Application Notes

Pentode section designed for video amplifier service; triode for general purpose amplifier/sync separator usage.

Datasheets

Datasheet: 8KR8.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 Voltage330 V
    Plate Dissipation5 W
    Grid 2 Voltage330 V
    H-C Voltage200 V

    Audio Performance

    Key Features
    • Sharp cutoff pentode
    • Medium mu triode
    • Video amplifier service
    • Sync separator
    • Sound IF amplifier