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

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EF70 vacuum tube outline illustration

Tube-number record

EF70

0 archive entries

EF70 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: brand Mullard, construction Pentode, socket B8D / B8F, maximum plate voltage 175 V, and maximum plate dissipation 0.75 W. The archive does not yet hold a photographed example of this type.

BrandMullard
ClassPentode
BaseB8D / B8F
Filament6.3 V @ 0.2 mA

Construction

Primary TypePentode
EnvelopeSubminiature
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage175 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode100 V2500100000383 mA

Application Notes

A diode is connected internally to the suppressor grid to prevent this grid locking at a positive voltage. Direct soldered connections must be at least 5mm from the seal.

Datasheets

Datasheet: EF70.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 Dissipation0.75 W
    Grid 2 Voltage175 V
    Cathode Current10 mA
    H-C Voltage100 V

    Audio Performance

    Key Features
    • Subminiature high slope r.f. pentode
    • Short suppressor grid base
    • Internal diode connected to suppressor grid