Tube-number record
UR3C
0 archive entries
UR3C is a tube type in the TubeDatabase archive (class: Rectifier). Recorded specifications: brand Mullard, construction Rectifier, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandMullard
ClassRectifier
Filament30 V @ 200 mA
Construction
Primary TypeRectifier
Rectifier TypeFull-wave
EnvelopeGlass
Sections2
Filament / Heater
Warm-up Time75s
Heater NotesIntended for series operation in D.C./A.C. amplifiers.
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier | 250 V | — | — | — | 120 mA |
Application Notes
In order to protect the valve it is essential that a resistance is included directly in each anode lead when large capacity smoothing condensers are used. Without these resistances the charging current of the first smoothing condenser may destroy the cathode of the rectifier should the amplifier be switched off and on again quickly.
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