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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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Tube-number record

U31

0 archive entries

U31 is a tube type in the TubeDatabase archive (class: Half Wave Rectifier). Recorded specifications: brand Marconi, construction Rectifier, socket Octal, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.

BrandMarconi
ClassHalf Wave Rectifier
BaseOctal
Filament26 V @ 300 mA

Construction

Primary TypeRectifier
EnvelopeGlass
Sections1

Filament / Heater

Heater NotesIndirectly heated; suitable for series operation in A.C./D.C. sets.

Absolute Maximum Ratings

Plate Voltage250 V

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Cathode Current100 mA

    Audio Performance

    Key Features
    • Indirectly heated
    • Low impedance
    • Minimum voltage drop