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BrandSFA
ClassMercury Vapour Rectifier
Base4-Pin British
Construction
Primary TypeHalf-wave rectifier
Rectifier TypeMercury Vapour
EnvelopeGlass
Base MaterialNot specified
SectionsSingle
Filament / Heater
MaterialDirectly heated
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage5000 V
Cathode Current250 mA
Audio Performance
Key Features
- Directly heated
- Mercury vapour
- Half-wave rectifier
- High voltage
- Delayed switching required
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Half-wave rectifier | 1750V | - | - | - | 250mA |
Application Notes
The valve must be mounted vertically, with the anode at the top. A choke input filter circuit must always be used. Ambient temperature must not exceed 35C. Filament must run for 15 minutes prior to anode voltage application when newly installed. A delay of 30 seconds is essential when switching on from cold.
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