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

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EF39 vacuum tube outline illustration

Tube-number record

EF39

0 archive entries

EF39 is a tube type in the TubeDatabase archive (class: PENTODE). Recorded specifications: brand PHILIPS, construction Pentode, socket Octal, maximum plate voltage 300 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.

BrandPHILIPS
ClassPENTODE
BaseOctal
Filament6.3 V @ 0.2 mA

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesIndirect; series or parallel supply

Absolute Maximum Ratings

Plate Voltage300 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF/IF Amplifier250 V22001200000—6 mA
AF Amplifier (Mode A)250 V106——0.87 mA
AF Amplifier (Mode B)250 V85——1.6 mA

Application Notes

Can be used without special precautions against microphonic effect in circuits where input voltage is >= 10 mV for an output of 50 mW.

Datasheets

Datasheet: EF39.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 Dissipation2 W
    Grid 2 Voltage300 V
    Grid 1 Voltage-1.3 V
    Cathode Current10 mA
    H-C Voltage100 V

    Audio Performance

    Key Features
    • Variable mutual conductance
    • Resistance coupling support
    • Low microphonic effect