3B28
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BrandStandard Telephones and Cables Limited
ClassRectifier
BaseAmerican medium 4-pin bayonet
Construction
Primary TypeGas-filled
Rectifier TypeHalf-wave
EnvelopeGlass
Base MaterialPlastic/Ceramic
Sections1
Filament / Heater
MaterialOxide-coated
Warm-up Time10s
Absolute Maximum Ratings
Plate Voltage10000 V
Cathode Current2000 mA
Audio Performance
Key Features
- Xenon-filled
- Operation in extremes of ambient temperature
- Mobile applications
- Unrestricted mounting position
- No heaters, fans or thermostats required for bulb temperature control
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Phase Full Wave | 3180V | - | - | - | 500mA |
| Single Phase Full Wave Bridge | 6360V | - | - | - | 500mA |
| Three Phase Half Wave | 4780V | - | - | - | 750mA |
| Three Phase Double Y Parallel | 4780V | - | - | - | 1500mA |
| Three Phase Full Wave | 9570V | - | - |
Application Notes
The 3B28 is designed for operation in high voltage circuits where extremes of ambient temperature are encountered. This rectifier being directly heated, it is recommended that the output circuit be taken from the mid-point of the filament supply transformer secondary winding.
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