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

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
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Tube-number record

U31

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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
Cathode Current100 mA

Audio Performance

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

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