2-25A
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BrandEimac
ClassHigh-Vacuum Rectifier
BaseSmall 4-pin (UX-4)
Construction
Primary TypeDiode
Rectifier TypeHigh-Vacuum
EnvelopeGlass
Base MaterialPlastic/UX
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Warm-up Time0.5s
Absolute Maximum Ratings
Plate Voltage25000 V
Plate Dissipation15 W
Cathode Current50 mA
Audio Performance
Key Features
- High-vacuum
- Thoriated-tungsten filament
- Convection and radiation cooling
- Flexible plate terminal lead recommended
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-phase Half-Wave (Capacitor Input Filter) | 8800V | - | 1200 | - | 40mA |
| Single-phase Bridge (Choke Input Filter) | 17600V | - | 1200 | - | 100mA |
| Unidirectional Conductor (DC Circuit) | - | - | 1200 | - | 90mA |
Application Notes
Intended for use in rectifier units, voltage multipliers, or special applications where gas-filled tubes are unsuitable due to temperature or frequency. Plate dissipation usually limits d-c current capability. Filament reaches operating temperature in a fraction of a second.
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