Tube-number record
280A
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BrandWestern Electric
ClassVacuum Tube
Base4-pin
Construction
Primary TypeRectifier
Rectifier TypeHalf-wave
EnvelopeGlass
Base MaterialStandard medium four-pin thrust type
SectionsSingle
Filament / Heater
MaterialThermionic
Warm-up Time10s
Absolute Maximum Ratings
Plate Voltage3500 V
Cathode Current500 mA
Audio Performance
Key Features
- Half-wave
- Mercury vapor
- Thermionic
- Small metal cap anode terminal
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Circuit A - Single Phase Half-Wave | 1000 V | — | — | — | 150 mA |
| Circuit B - Single Phase Double Half-Wave | 1000 V | — | — | — | 300 mA |
| Circuit G - Three Phase Double Y Interconnected | 1500 V | — | — | — |
Application Notes
Sufficient time must be allowed for filament temperature to reach operating value before anode potential is applied. Minimum 10 seconds. For temperatures below 20C, longer periods required (up to 12 minutes at 10C).
Datasheets
Datasheet: 280A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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