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

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HCH 81 vacuum tube outline illustration

Tube-number record

HCH 81

0 archive entries

HCH 81 is a tube type in the TubeDatabase archive (class: Triode-Heptode). Recorded specifications: brand Philips, construction Multi-section, base Glass, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 1.7 W. The archive does not yet hold a photographed example of this type.

BrandPhilips
ClassTriode-Heptode
BaseNoval (B9A)
Filament12.6 V @ 150 mA

Construction

Primary TypeMulti-section
EnvelopeGlass
Base MaterialGlass
SectionsTwo (Triode and Heptode)

Filament / Heater

Heater NotesIndirect; series or parallel supply

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Triode Section100 V3700—2213.5 mA
Heptode Section Mixer200 V7751000000—3.7 mA
Heptode Section R.F./I.F. Amplifier200 V2400500000—7.4 mA

Datasheets

Datasheet: HCH81.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 Dissipation1.7 W
    Grid 2 Voltage125 V
    Grid 1 Voltage-1.3 V
    Cathode Current12.5 mA
    H-C Voltage100 V

    Audio Performance

    Key Features
    • Low microphonic effect
    • A.M./F.M. receiver compatible
    • Controlled inter-section capacitance