Tube-number record
2V/561E
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BrandStandard Telephones and Cables Limited
ClassHalf-Wave Mercury-Vapour Rectifier
BaseSpecial / none
Construction
Primary TypeRectifier
Rectifier TypeMercury-Vapour
EnvelopeGlass
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialOxide-coated, shielded
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage20000 V
Cathode Current7500 mA
Audio Performance
Key Features
- Shielded filament
- Equivalent to 4079A
- Mercury-vapour
- Forced air cooling recommended
- Directly heated cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-Phase Full Wave (In Phase) | 6300 V | — | — | — | 42.5 mA |
| Three-Phase Half Wave (In Phase) | 9550 V | — | — | — | 18.75 mA |
Application Notes
After shipment or transit the valve must be pre-heated for not less than 30 minutes before any anode voltage is applied. Forced air cooling is recommended and is required for operation up to the limit of condensed mercury temperature.
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