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

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271A vacuum tube outline illustration

Tube-number record

271A

0 archive entries

271A is a tube type in the TubeDatabase archive (class: Moderate-power triode). Recorded specifications: brand Western Electric, construction Triode, socket Special / none, and maximum plate voltage 450 V. The archive does not yet hold a photographed example of this type.

BrandWestern Electric
ClassModerate-power triode
BaseSpecial / none
Filament5 V @ 2000 mA

Construction

Primary TypeTriode
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesDesigned to operate on a voltage basis; AC or DC.

Absolute Maximum Ratings

Plate Voltage450 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Operation300 V225036508.219.5 mA
Typical Operation350 V230035508.121.5 mA
Typical Operation400 V235034508.124.5 mA

Application Notes

Applications include audio-frequency amplifier or modulator, radio-frequency power amplifier, and oscillator. Cathode can be connected to heater terminal 5 or a transformer center tap for minimum hum.

Datasheets

Datasheet: 271A.pdf

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

Filters

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Manufacturers

Brands

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    Grid 1 Voltage20 V
    Cathode Current60 mA
    H-C Voltage90 V

    Audio Performance

    Power Output3.4 W
    Key Features
    • Indirectly heated cathode
    • Low hum level (30dB lower than filamentary tubes)
    • Moderate-power triode
    • Flexible mounting position
    Maximum Operating Conditions450 V348024508.557.5 mA