A214
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BrandMarconi's Wireless Telegraph Company Limited
ClassRectifier
Construction
Primary TypeOil-insulated rectifier
Rectifier TypeHalf wave / Full wave bridge
EnvelopeGlass
Base MaterialMetal/Plastic with 2 Pins
Sections1
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage125000 V
Cathode Current500 mA
Audio Performance
Key Features
- Oil-insulated
- Designed for X-ray apparatus
- Manual or Automatic filament switching ratings
- High peak inverse voltage
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Continuous duty | - | - | - | - | 50mA |
| Intermittent duty - Manual filament switching | - | - | - | - | 300mA |
| Intermittent duty - Automatic filament boost | - | - | - | - | 500mA |
Application Notes
The A214 is designed for use in X-ray apparatus and must be operated while oil-insulated. The oil must have a dielectric strength of at least 25,000 volts per 0.1 inch and be free of dirt and moisture. Ratings apply to full-wave bridge circuits; for half-wave circuits, current values must be halved.
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