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

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257A vacuum tube outline illustration

Tube-number record

257A

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257A is a tube type in the TubeDatabase archive (class: triode). Recorded specifications: brand Western Electric, construction Triode, base Small, four-pin, thrust base, socket Special / none, and maximum plate voltage 135 V. The archive does not yet hold a photographed example of this type.

BrandWestern Electric
Classtriode
BaseSpecial / none

Construction

Primary TypeTriode
Envelopeglass
Base MaterialSmall, four-pin, thrust base
Sectionssingle

Filament / Heater

Materialfilamentary

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier67.5 V380225008.50.93 mA
Class A Amplifier90 V510163008.42.1 mA
Maximum Operating Condition135 V540156008.42.5 mA

Application Notes

Audio-frequency and intermediate-frequency amplifier, detector, oscillator.

Datasheets

Datasheet: 257A.pdf

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

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    Plate Voltage135 V
    Grid 1 Voltage-7.5 V

    Audio Performance

    Power Output50 W
    Key Features
    • Low filament power consumption
    • Small metal cap grid terminal at the top of the bulb