250R
0 Tubes in archive
BrandEimac
ClassHigh-Vacuum Rectifier
Base50-watt jumbo 4-pin bayonet
Construction
Primary TypeDiode
EnvelopeGlass
Base MaterialBayonet
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage60000 V
Plate Dissipation150 W
Cathode Current250 mA
Audio Performance
Key Features
- High-vacuum diode
- Thoriated tungsten filament
- Convection and Radiation cooling
- High peak inverse voltage rating
- Operates in extreme ambient temperatures
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-Phase Half-Wave, Capacitor-Input Filter | 24000V | - | 750 | - | 160mA |
| Single-Phase Full-Wave, Choke-Input Filter | 19000V | - | 750 | - | 500mA |
| Single-Phase Bridge, Choke-Input Filter | 38000V | - | 750 | - | 500mA |
| Unidirectional conductor in d-c circuits | - | - | 750 | - | 400mA |
Application Notes
The 250R must be mounted vertically with the base either down or up. The lead to the plate terminal should be flexible. Requires Eimac HR-6 heat dissipating connector. Filament voltage must be maintained within 4.75 to 5.25 volts.
Datasheet Viewer
Loading datasheet...
Sort by
Showing 1 to 0 of 0 results