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

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6H8G vacuum tube outline illustration

Tube-number record

6H8G

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6H8G is a tube type in the TubeDatabase archive (class: Double Diode - Pentode). Recorded specifications: brand Mazda, construction Multi-section, socket Octal, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.

BrandMazda
ClassDouble Diode - Pentode
BaseOctal
Filament6.3 V @ 300 mA

Construction

Primary TypeMulti-section
EnvelopeV5
Sections3

Filament / Heater

Heater NotesCC ou CA

Absolute Maximum Ratings

Plate Voltage250 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A (Example 1)100 V20004000008005.5 mA
Class A (Example 2)100 V210090000019005.7 mA
Class A (Example 3)250 V2100110000023005.7 mA

Application Notes

The two diodes share a common cathode with the pentode. Used for detection and AVC (Automatic Volume Control) while the pentode serves as an amplifier.

Datasheets

Datasheet: 6H8G.pdf

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

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    Grid 2 Voltage
    125 V

    Audio Performance

    Key Features
    • Indirectly heated cathode
    • External metallization
    • Top cap connection for Grid 1
    Class A (Example 4)250 V230065000015508.5 mA