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

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4R-HH2 vacuum tube outline illustration

Tube-number record

4R-HH2

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4R-HH2 is a tube type in the TubeDatabase archive (class: Medium-mu Twin Triode). Recorded specifications: construction Dual triode, socket Noval (B9A), maximum plate voltage 150 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.

ClassMedium-mu Twin Triode
BaseNoval (B9A)
Filament4.2 V @ 600 mA

Construction

Primary TypeDual triode
EnvelopeGlass
Sections2

Filament / Heater

Heater NotesTransformer-less television receivers

Absolute Maximum Ratings

Plate Voltage150 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF Amplifier90 V8000—368.5 mA

Application Notes

Specifically designed for use as a cascade connected RF amplifier in the VHF tuner of transformer-less television receivers.

Datasheets

Datasheet: 4R-HH2.pdf

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

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    Plate Dissipation2 W
    Cathode Current20 mA
    H-C Voltage200 V

    Audio Performance

    Key Features
    • Cascade connected RF amplifier
    • High sensitivity
    • Low noise
    • Designed for VHF tuners