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

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EF50 vacuum tube outline illustration

Tube-number record

EF50

0 archive entries

EF50 is a tube type in the TubeDatabase archive (class: R.F. Pentode). Recorded specifications: brand Mullard, construction Pentode, socket B9G (EF50), and maximum plate voltage 300 V. The archive does not yet hold a photographed example of this type.

BrandMullard
ClassR.F. Pentode
BaseB9G (EF50)
Filament6.3 V @ 300 mA

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

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

Absolute Maximum Ratings

Plate Voltage300 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF Amplifier250 V65001000000—10 mA
RF Amplifier (A.G.C.)250 V65001000000—10 mA

Datasheets

Datasheet: EF50.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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    Grid 2 Voltage300 V
    Grid 1 Voltage-1.3 V
    Cathode Current15 mA
    H-C Voltage100 V

    Audio Performance

    Key Features
    • Single-ended
    • High slope
    • Fully controlled by voltages 0 to -6V or 0 to -55V