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

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PL81A vacuum tube outline illustration

Tube-number record

PL81A

0 archive entries

PL81A is a tube type in the TubeDatabase archive (class: Line output pentode). Recorded specifications: brand Mullard, construction Pentode, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 8 W. The archive does not yet hold a photographed example of this type.

BrandMullard
ClassLine output pentode
BaseNoval (B9A)
Filament21.5 V @ 300 mA

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesSuitable for series operation a.c. or d.c.

Absolute Maximum Ratings

Plate Voltage250 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Characteristics170 V6500115004.945 mA

Application Notes

Operation so that the anode potential of the output valve at the end of the scan is above the knee of the anode characteristic is recommended.

Datasheets

Datasheet: PL81A.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 Dissipation8 W
    Grid 2 Voltage250 V
    Grid 1 Voltage-120 V
    Cathode Current180 mA
    H-C Voltage200 V

    Audio Performance

    Key Features
    • Series operation
    • Portable television receivers