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

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D3A vacuum tube outline illustration

Tube-number record

D3A

0 archive entries

D3A is a tube type in the TubeDatabase archive (class: Wideband Pentode). Recorded specifications: brand Siemens, construction Pentode, socket Noval (B9A), maximum plate voltage 220 V, and maximum plate dissipation 4.2 W. The archive does not yet hold a photographed example of this type.

BrandSiemens
ClassWideband Pentode
BaseNoval (B9A)
Filament6.3 V @ 315 mA

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated, parallel supply

Absolute Maximum Ratings

Plate Voltage220 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode190 V350001200008022 mA
Triode160 V4100019007724 mA

Application Notes

Specifically designed for wideband amplifiers in telecommunications, ZF and coaxial cable amplifiers, and pulse amplifiers.

Datasheets

Datasheet: D3a.pdf

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

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    Plate Dissipation4.2 W
    Grid 2 Voltage180 V
    Grid 1 Voltage-10 V
    Cathode Current30 mA
    H-C Voltage60 V

    Audio Performance

    Typical THD0.4%
    Power Output0.42 W
    Key Features
    • Long life
    • High reliability
    • Tight tolerances
    • Interface-layer-free special cathode
    • High transconductance