GU7
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BrandMarconi's Wireless Telegraph Company Limited
ClassPower Rectifier
Construction
Primary TypeMercury vapour diode
Rectifier Typehalf-wave
EnvelopeGlass
Sectionssingle
Filament / Heater
Materialdirectly heated
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage13500 V
Cathode Current4000 mA
Audio Performance
Key Features
- Directly heated
- Mercury vapour
- Half-wave diode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Bi-phase half-wave (2 valves) | 4300V | - | - | - | 8000mA |
| Single-phase full-wave (4 valves) | 8600V | - | - | - | 8000mA |
| Three-phase half-wave (3 valves) | 6000V | - | - | - | 12000mA |
| Three-phase full-wave (6 valves) | 12000V | - | - | - | 12000mA |
| Double three-phase interconnected (6 valves) | 6000V | - |
Application Notes
Minimum delay time of one minute required before anode voltage application if ambient temperature is above 32°C. New or stored valves must be seasoned by running the filament for 30 minutes at normal voltage.
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