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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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6028/408A vacuum tube outline illustration

Tube-number record

6028/408A

0 archive entries

6028/408A is a tube type in the TubeDatabase archive (class: RF Amplifier Pentode). Recorded specifications: construction Pentode, socket Miniature 7-pin (B7G), maximum plate voltage 200 V, and maximum plate dissipation 1.85 W. The archive does not yet hold a photographed example of this type.

ClassRF Amplifier Pentode
BaseMiniature 7-pin (B7G)
Filament20 V @ 50 mA

Construction

Primary TypePentode
EnvelopeT 5 1/2
Sections1

Filament / Heater

Absolute Maximum Ratings

Plate Voltage200 V
Plate Dissipation1.85 W

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 (200 Ohm Bias)120 V5000—247.5 mA
Class A1 (130 Ohm Bias)120 V560025000249.4 mA

Application Notes

Particularly suitable for use as RF amplifier and broadband amplifier.

Filters

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Manufacturers

Brands

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    Grid 2 Voltage
    155 V
    Grid 1 Voltage-50 V
    Cathode Current20 mA
    H-C Voltage130 V

    Audio Performance

    Typical THD12%
    Power Output0.325 W
    Key Features
    • RF amplifier
    • broadband amplifier
    • Small Button Miniature 7-pin