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

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Tube-number record

4CM4

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4CM4 is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Telefunken, construction Triode, socket Noval (B9A), maximum plate voltage 220 V, and maximum plate dissipation 2.2 W. The archive does not yet hold a photographed example of this type.

BrandTelefunken
ClassTriode
BaseNoval (B9A)
Filament3.8 V @ 300 mA

Construction

Primary TypeTriode
EnvelopeT 6 1/2
SectionsSingle

Filament / Heater

Heater Notesac or dc

Absolute Maximum Ratings

Plate Voltage220 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
grounded-grid amplifier175 V14000—6812 mA

Application Notes

Specifically designed for grounded-grid amplifier operation up to UHF frequencies.

Datasheets

Datasheet: 4CM4.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 Dissipation
    2.2 W
    Grid 1 Voltage-50 V
    Cathode Current20 mA
    H-C Voltage100 V

    Audio Performance

    Key Features
    • Coated unipotential cathode
    • Grounded-grid amplifier application