Tube-number record
274A
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BrandWestern Electric
ClassRectifier
Base4-pin
Construction
Primary TypeRectifier
Rectifier TypeThermionic high vacuum
EnvelopeGlass
Base MaterialMedium four-pin thrust
Sections2
Filament / Heater
MaterialFilament type
Absolute Maximum Ratings
Plate Voltage660 V
Cathode Current200 mA
Audio Performance
Key Features
- Full-wave thermionic rectifier
- Common filament for two diode units
- Vertical or horizontal mounting
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Choke-Input Filter | 550 V | — | — | — | 160 mA |
| Choke-Input Filter (Maximum) | 550 V | — | — | — | 200 mA |
| Choke-Input Filter (Maximum) | 660 V | — | — | — | 160 mA |
Application Notes
The choke-input filter is preferred over the condenser-input filter for better regulation and longer tube life. Maximum input capacitance for condenser-input filters should not exceed 4 microfarads.
Datasheets
Datasheet: 274A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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