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

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25B6G vacuum tube outline illustration

Tube-number record

25B6G

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25B6G is a tube type in the TubeDatabase archive (class: Power Pentode). Recorded specifications: brand Sylvania, construction Pentode, socket Octal, maximum plate voltage 180 V, and maximum plate dissipation 9.5 W. The archive does not yet hold a photographed example of this type.

BrandSylvania
ClassPower Pentode
BaseOctal
Filament25 V @ 300 mA

Construction

Primary TypePentode
EnvelopeST-14
Sections1

Filament / Heater

Heater NotesAC or DC

Absolute Maximum Ratings

Plate Voltage180 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier (Condition 1)105 V480015500—48 mA
Class A Amplifier (Condition 2)135 V500015000—61 mA

Application Notes

The Sylvania 25B6G is a power amplifier pentode specifically intended for the output stage of universal and 110V DC receivers. While similar to types 25A6G and 43, it possesses significant characteristic differences.

Datasheets

Datasheet: 25B6G.pdf

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

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    Plate Dissipation
    9.5 W
    Grid 2 Voltage135 V

    Audio Performance

    Typical THD14%
    Power Output4.3 W
    Key Features
    • Power Pentode
    • Designed for universal and DC 110V receivers