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

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Tube-number record

EL31

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EL31 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Mullard, construction Pentode, base Standard, socket Octal, maximum plate voltage 800 V, and maximum plate dissipation 25 W. The archive does not yet hold a photographed example of this type.

BrandMullard
ClassOutput Pentode
BaseOctal
Filament6.3 V @ 1.4 mA

Construction

Primary TypePentode
EnvelopeGlass
Base MaterialStandard
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Single Valve275 V140002000016.591 mA
Single Valve600 V700043000—42 mA

Application Notes

The EL31 is particularly suited for power amplifiers in push-pull stages. An anode top cap is used to permit maximum anode voltages up to 800V. For lower power, two EL37 valves in push-pull are normally used.

Datasheets

Datasheet: EL31.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 Voltage800 V
    Plate Dissipation25 W
    Grid 2 Voltage400 V
    Grid 1 Voltage-1.3 V
    Cathode Current200 mA
    H-C Voltage100 V

    Audio Performance

    Typical THD13.1%
    Power Output12 W
    Key Features
    • Anode top cap
    • 25 Watt plate dissipation
    • High power output up to 100W in push-pull