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

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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3W4/3S4-SF vacuum tube outline illustration

Tube-number record

3W4/3S4-SF

0 archive entries

3W4/3S4-SF is a tube type in the TubeDatabase archive (class: Power Amplifier Pentode). Recorded specifications: brand Federation of Japan Electric Communication Industrial Associations, construction Pentode, base Glass, socket Miniature 7-pin (B7G), and maximum plate voltage 99 V. The archive does not yet hold a photographed example of this type.

BrandFederation of Japan Electric Communication Industrial Associations
ClassPower Amplifier Pentode
BaseMiniature 7-pin (B7G)

Construction

Primary TypePentode
EnvelopeT-5 1/2
Base MaterialGlass
SectionsSingle

Filament / Heater

Materialcoated

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier85 V1700150000—6.8 mA

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    Plate Voltage
    99 V
    Grid 2 Voltage90 V
    Cathode Current11 mA

    Audio Performance

    Typical THD12%
    Power Output0.25 W
    Key Features
    • Series/Parallel Filament Operation
    • Directly Heated Cathode