Tube-number record
253A
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BrandWestern Electric
ClassHalf-wave mercury vapor rectifier
BaseSpecial / none
Construction
Primary TypeMercury Vapor
Rectifier TypeHalf-wave
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThermionic
Warm-up Time10s
Absolute Maximum Ratings
Plate Voltage3500 V
Cathode Current500 mA
Audio Performance
Key Features
- Half-wave rectifier
- Mercury vapor
- Vertical mounting
- Top anode cap
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Phase, Half-wave (Circuit A) | 1000 V | — | — | — | 150 mA |
| Single Phase, Double Half-wave (Circuit B) | 1000 V | — | — | — | 300 mA |
| Single Phase, Double Half-wave Parallel (Circuit C) | 1000 V | — | — | — |
Application Notes
The tube should be mounted only in a vertical position with the base end down. Sufficient time must always be allowed for the filament temperature to reach its normal operating value before the anode potential is applied. If the tube is operated at ambient temperatures below 20C, a longer period is required to bring mercury vapor pressure to a satisfactory value (5 mins at 15C, 12 mins at 10C).
Datasheets
Datasheet: 253A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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