Tube-number record
250R
0 archive entries
250R is a tube type in the TubeDatabase archive (class: High-Vacuum Rectifier). Recorded specifications: brand Eimac, construction Diode, base Bayonet, socket 4-pin, maximum plate voltage 60000 V, and maximum plate dissipation 150 W. The archive does not yet hold a photographed example of this type.
BrandEimac
ClassHigh-Vacuum Rectifier
Base4-pin
Construction
Primary TypeDiode
EnvelopeGlass
Base MaterialBayonet
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-Phase Half-Wave, Capacitor-Input Filter | 24000 V | — | 750 | — | 160 mA |
| Single-Phase Full-Wave, Choke-Input Filter | 19000 V | — | 750 | — | 500 mA |
| Single-Phase Bridge, Choke-Input Filter | 38000 V | — | 750 | — |
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.
Datasheets
Datasheet: 250R.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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