Tube-number record
U78
0 archive entries
U78 is a tube type in the TubeDatabase archive (class: Rectifier). Recorded specifications: brand Marconi, year 1952, construction Indirectly heated, socket Miniature 7-pin (B7G), and maximum plate voltage 325 V. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassRectifier
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 600 mA
Construction
Primary TypeIndirectly heated
Rectifier TypeBi-Phase Half Wave
EnvelopeTubular
Sections2
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Capacitor Input | 325 V | — | — | — | 70 mA |
Application Notes
A retaining device should be used. Free air circulation is preferable. The hottest part of the bulb must not exceed 250°C.
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