Tube-number record
2-25A
0 archive entries
2-25A is a tube type in the TubeDatabase archive (class: High-Vacuum Rectifier). Recorded specifications: brand Eimac, year 1952, construction Diode, base Plastic/UX, socket 4-pin, maximum plate voltage 25000 V, and maximum plate dissipation 15 W. The archive does not yet hold a photographed example of this type.
BrandEimac
ClassHigh-Vacuum Rectifier
Base4-pin
Construction
Primary TypeDiode
Rectifier TypeHigh-Vacuum
EnvelopeGlass
Base MaterialPlastic/UX
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single-phase Half-Wave (Capacitor Input Filter) | 8800 V | — | 1200 | — | 40 mA |
| Single-phase Bridge (Choke Input Filter) | 17600 V | — | 1200 | — | 100 mA |
| Unidirectional Conductor (DC Circuit) | — | — | 1200 | — |
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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