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

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247A vacuum tube outline illustration

Tube-number record

247A

0 archive entries

247A is a tube type in the TubeDatabase archive (class: Low-power triode). Recorded specifications: brand Western Electric, construction Triode, socket 5-pin, and maximum plate voltage 180 V. The archive does not yet hold a photographed example of this type.

BrandWestern Electric
ClassLow-power triode
Base5-pin
Filament2 V @ 1.6 mA

Construction

Primary TypeTriode
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesAC or DC; Heater-to-cathode voltage should not exceed 90V.

Absolute Maximum Ratings

Plate Voltage180 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Voltage Amplifier135 V9401600015.23.2 mA
Maximum Operating Condition180 V9401570014.93.6 mA
Typical Power Output150 V5802410013.91.4 mA

Application Notes

Used as audio-frequency voltage amplifier, low-power audio amplifier, oscillator, and detector. Cathode should be connected to heater transformer center-tap to reduce hum.

Datasheets

Datasheet: 247A.pdf

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

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    Grid 1 Voltage-11 V
    H-C Voltage90 V

    Audio Performance

    Power Output0.096 W
    Key Features
    • Indirectly heated cathode
    • Low microphonic noise
    • Eliminated sputtering sounds