Tube-number record
4274-A
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4274-A is a tube type in the TubeDatabase archive (class: Full Wave High Vacuum Rectifier). Recorded specifications: brand Standard Valves, construction Rectifier, socket 4-pin, and maximum plate voltage 660 V. The archive does not yet hold a photographed example of this type.
BrandStandard Valves
ClassFull Wave High Vacuum Rectifier
Base4-pin
Construction
Primary TypeRectifier
Rectifier TypeFull Wave
EnvelopeGlass
Sections2
Filament / Heater
MaterialOxide coated
Absolute Maximum Ratings
Plate Voltage660 V
Cathode Current200 mA
Audio Performance
Key Features
- Full wave thermionic
- High vacuum
- Oxide coated filament
- Constant voltage type filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Choke Input Filter (A) | 550 V | — | — | — | 160 mA |
| Condenser Input Filter (B) | 450 V | — | — | — | 140 mA |
Application Notes
Maximum input filter capacity for condenser input filter is 4 µF.
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