U78
0 Tubes in archive
BrandMarconi
ClassRectifier
BaseB7G
Filament6.3V @ 600mA
Construction
Primary TypeIndirectly Heated
Rectifier TypeBi-Phase Half Wave
EnvelopeTubular
Sections2
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage325 V
Cathode Current70 mA
H-C Voltage450 V
Audio Performance
Key Features
- Miniature
- Bi-phase half wave
- Any mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Capacitor Input | 325V | - | - | - | 70mA |
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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