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

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12J5 vacuum tube outline illustration

Tube-number record

12J5

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12J5 is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand General Electric, construction Triode, socket Octal, maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.

BrandGeneral Electric
ClassTriode
BaseOctal
Filament12.6 V @ 150 mA

Construction

Primary TypeTriode
EnvelopeMT-8 Metal Shell
SectionsSingle

Filament / Heater

Heater NotesA-C or D-C

Absolute Maximum Ratings

Plate Voltage300 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier90 V300067002010 mA
Class A Amplifier250 V26007700209 mA

Application Notes

Identical to the 6J5 except for heater ratings. The d-c resistance in the grid circuit under maximum rated conditions should not exceed 1.0 megohm.

Datasheets

Datasheet: 12J5.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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Brands

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    Plate Dissipation2.5 W
    Cathode Current20 mA
    H-C Voltage90 V

    Audio Performance

    Typical THD5%
    Key Features
    • Medium-mu triode
    • General-purpose
    • Coated Unipotential Cathode