U709
0 Tubes in archive
BrandMarconi
ClassRectifier
BaseB9A
Filament6.3V @ 950mA
Construction
Primary TypeMiniature
Rectifier TypeBi-phase half-wave
EnvelopeTubular
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage350 V
Cathode Current150 mA
H-C Voltage450 V
Audio Performance
Key Features
- Indirectly heated
- Miniature construction
- Mounting in any position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single valve, Bi-phase half-wave, Capacitor input | 350V | - | - | - | 150mA |
Application Notes
Free air circulation is preferable for cooling. A retaining device should be used.
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