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

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Tube-number record

20F2

0 archive entries

20F2 is a tube type in the TubeDatabase archive (class: Television Screened Pentode). Recorded specifications: brand Ediswan Mazda, construction Pentode, base Moulded, socket Rimlock, maximum plate voltage 250 V, and maximum plate dissipation 4 W. The archive does not yet hold a photographed example of this type.

BrandEdiswan Mazda
ClassTelevision Screened Pentode
BaseRimlock
Filament11 V @ 200 mA

Construction

Primary TypePentode
EnvelopeGlass
Base MaterialMoulded
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated—for series operation

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Screened Pentode140 V1060012500033—

Application Notes

Mounting Position—Unrestricted. Measured with respect to the higher potential heater pin.

Datasheets

Datasheet: 20F2.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 Voltage250 V
    Plate Dissipation4 W
    Grid 2 Voltage250 V
    H-C Voltage250 V

    Audio Performance

    Key Features
    • Indirectly heated
    • Series operation
    • Replacement type
    • High mutual conductance