274A
0 Tubes in archive
BrandWestern Electric
ClassRectifier
BaseMedium, four-pin thrust type
Construction
Primary TypeFull-wave rectifier
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 | 550V | - | - | - | 160mA |
| Choke-Input Filter (Maximum) | 550V | - | - | - | 200mA |
| Choke-Input Filter (Maximum) | 660V | - | - | - | 160mA |
| Condenser-Input Filter | 450V | - | - | - | 140mA |
| Condenser-Input Filter (Maximum) | 450V | - | - |
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.
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