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

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ECH 4 vacuum tube outline illustration

Tube-number record

ECH 4

0 archive entries

ECH 4 is a tube type in the TubeDatabase archive (class: Triode-heptode). Recorded specifications: construction Multi-section, socket Side-contact (P-base), maximum plate voltage 300 V, and maximum plate dissipation 1.5 W. The archive does not yet hold a photographed example of this type.

ClassTriode-heptode
BaseSide-contact (P-base)
Filament6.3 V @ 0.2 mA

Construction

Primary TypeMulti-section
EnvelopeGlass
Sections2

Filament / Heater

Heater NotesIndirect heating, AC/DC

Absolute Maximum Ratings

Plate Voltage300 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Heptode Mixer250 V7501400000—3 mA
Heptode IF Amplifier250 V2200900000—5.3 mA
Triode Static100 V3200—2212 mA

Application Notes

Commonly used as a frequency changer/mixer where the triode serves as the local oscillator.

Datasheets

Datasheet: ECH4.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 Dissipation1.5 W
    Grid 2 Voltage300 V
    Grid 1 Voltage-1.3 V
    Cathode Current15 mA
    H-C Voltage50 V

    Audio Performance

    Typical THD1.5%
    Key Features
    • Triode and heptode sections separate
    • Applicable as mixer, IF amplifier, or phase inverter
    • High gain triode
    Triode AF Amplifier (R-C coupled)250 V——131 mA