F-857-B
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BrandFederal Telephone and Radio Corporation
ClassMercury Vapor Half-Wave Rectifier
Construction
Primary TypeHalf-Wave Rectifier
Rectifier TypeMercury Vapor
EnvelopeGlass
Sections1
Filament / Heater
MaterialMercury Vapor
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage22000 V
Cathode Current10000 mA
Audio Performance
Key Features
- Mercury vapor
- High-voltage rectifier
- Vertical mounting
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Phase - Half Wave (Circuit A) | 15500V | - | - | - | 10000mA |
| Single Phase - Full Wave (Circuit B) | 7750V | - | - | - | 20000mA |
| Single Phase - Full Wave Parallel (Circuit C) | 7750V | - | - | - | 40000mA |
| Single Phase - Full Wave Bridge (Circuit D) | 15500V | - | - | - | 20000mA |
| Three Phase - Half Wave (Circuit E) | 9000V | - | - | - | 30000mA |
| Double Three Phase - Half Wave (Circuit F) | 9000V | - | - | - | 60000mA |
| Three Phase - Full Wave (Circuit G) | 9000V | - | - | - | 30000mA |
| Six Phase - Half Wave (Circuit H) | 7750V | - | - | - | 60000mA |
Application Notes
For sine wave input and choke input filter to maintain output current substantially constant. Condensed mercury temperature should be measured in the specified zone near the base.
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