Tube-number record
PX25A
0 archive entries
PX25A is a tube type in the TubeDatabase archive (class: Power Amplifying Triode). Recorded specifications: brand Osram, construction Triode, socket 4-pin, maximum plate voltage 400 V, and maximum plate dissipation 25 W. The archive does not yet hold a photographed example of this type.
BrandOsram
ClassPower Amplifying Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Sectionssingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage400 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Valve Class A | 400 V | 3700 | 860 | 3.2 | 62.5 mA |
| Single Valve Class A | 350 V | — | — | — | 60 mA |
| Single Valve Class A | 300 V | — | — | — | 50 mA |
Application Notes
Intended for use in the last stage of Low Frequency Amplifiers, particularly in low impedance loading push-pull circuits. By the use of a pair of PX25A Valves in a push-pull circuit with low impedance loads, it is possible to obtain an undistorted power output up to 32 watts per pair.
Datasheets
Datasheet: PX25A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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