Tube-number record
3B28
0 archive entries
3B28 is a tube type in the TubeDatabase archive (class: Rectifier). Recorded specifications: brand Standard Telephones and Cables Limited, construction Other / special, base Plastic/Ceramic, socket 4-pin, and maximum plate voltage 10000 V. The archive does not yet hold a photographed example of this type.
BrandStandard Telephones and Cables Limited
ClassRectifier
Base4-pin
Construction
Primary TypeOther / special
Rectifier TypeHalf-wave
EnvelopeGlass
Base MaterialPlastic/Ceramic
Sections1
Filament / Heater
MaterialOxide-coated
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Phase Full Wave | 3180 V | — | — | — | 500 mA |
| Single Phase Full Wave Bridge | 6360 V | — | — | — | 500 mA |
| Three Phase Half Wave | 4780 V | — | — | — | 750 mA |
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.
Datasheets
Datasheet: 3B28.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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