AH205/857B
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BrandEnglish Electric Valve Company Limited
ClassMercury Vapour Rectifier
BaseFlexible leads
Construction
Primary TypeMercury Vapour Rectifier
Rectifier TypeHot Cathode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide coated
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage22000 V
Cathode Current10000 mA
Audio Performance
Key Features
- X-ray emission above 16kV
- High power industrial usage
- Condensed mercury temperature control required
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single phase full wave (30-40C mercury) | 7000V | - | - | - | 20000mA |
| Three phase full wave (30-40C mercury) | 21000V | - | - | - | 30000mA |
Application Notes
The AH205/857B emits X-rays when operated with a peak inverse anode voltage above 16kV absolute. Adequate shielding must be provided.
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