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

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304B vacuum tube outline illustration

Tube-number record

304B

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304B is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Western Electric, construction Triode, socket 4-pin, maximum plate voltage 1250 V, and maximum plate dissipation 50 W. The archive does not yet hold a photographed example of this type.

BrandWestern Electric
ClassTriode
Base4-pin

Construction

Primary TypeTriode
EnvelopeGlass
SectionsSingle

Filament / Heater

MaterialThoriated tungsten

Absolute Maximum Ratings

Plate Voltage1250 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Average Characteristics1250 V200055001140 mA
Class B Audio Amplifier (per pair)1250 V———100 mA
Class C RF Oscillator1250 V———

Application Notes

Designed for ultra high frequencies. Grid and plate terminals at top of bulb require cooling lugs for operation above 30 megacycles. Free circulation of air must be provided.

Datasheets

Datasheet: 304B.pdf

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

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    Plate Dissipation50 W
    Grid 1 Voltage-225 V
    Cathode Current100 mA

    Audio Performance

    Power Output140 W
    Key Features
    • Air-cooled
    • Ultra high frequency operation
    • Interchangeable with 304A
    100 mA