872A
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BrandStandard Telephones and Cables Limited
ClassMercury-Vapour Rectifier
Base4009C or 4039A
Construction
Primary TypeHalf-Wave Mercury-Vapour Rectifier
Rectifier TypeMercury-Vapour
EnvelopeGlass
Base MaterialPlastic
SectionsSingle
Filament / Heater
MaterialOxide-coated
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage10000 V
Cathode Current1250 mA
Audio Performance
Key Features
- Half-Wave Mercury-Vapour Rectifier
- Shielded oxide-coated filament
- Natural or forced ventilation
- High power output
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Phase Full-Wave | 3200V | - | - | - | 2500mA |
| Single Phase Full-Wave Bridge | 6400V | - | - | - | 2500mA |
| Three Phase Half-Wave | 4780V | - | - | - | 3750mA |
| Three Phase Double Y Parallel | 4780V | - | - | - | 7500mA |
| Three Phase Full-Wave | 9570V | - | - | - | 3750mA |
Application Notes
The valve must be pre-heated for 30 minutes before any anode voltage is applied after shipment or transit. Ratings apply with choke-input filter and 50 c/s supply. Output circuit should be taken from the mid-point of the filament supply transformer secondary.
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