Tube-number record
MU.25
0 archive entries
MU.25 is a tube type in the TubeDatabase archive (class: Rectifier). Recorded specifications: brand EDISWAN, year 1948, construction Rectifier, and maximum plate voltage 500 V. The archive does not yet hold a photographed example of this type.
BrandEDISWAN
ClassRectifier
Construction
Primary TypeRectifier
Rectifier TypeHalf-wave
EnvelopeGlass
Sections1
Filament / Heater
MaterialOxide coated cathode
Warm-up Time300s
Absolute Maximum Ratings
Plate Voltage500 V
Cathode Current2500 mA
Audio Performance
Key Features
- Indirectly heated
- Oxide coated cathode
- Half-wave
- Mercury vapour
Application Notes
Care should be taken in installation to ensure free circulation of air around bulb in order that the temperature limits are not exceeded. When the mercury vapour rectifier is first placed into service, the cathode should be operated at normal voltage for 15 minutes, without anode voltage in order to obtain correct distribution of the mercury.
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