Tube-number record
AH205/857B
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BrandEnglish Electric Valve Company Limited
ClassMercury Vapour Rectifier
BaseFlexible / flying leads
Construction
Primary TypeRectifier
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) | 7000 V | — | — | — | 20000 mA |
| Three phase full wave (30-40C mercury) | 21000 V | — | — | — | 30000 mA |
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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