PX25A
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BrandOsram
ClassPower Amplifying Triode
Base4-pin
Construction
Primary Typetriode
EnvelopeGlass
Sectionssingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation25 W
Audio Performance
Power Output32 W
Key Features
- Directly Heated Filament
- Large power handling capacity
- Push-pull operation support
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Valve Class A | 400V | 3700 | 860 | 3.2 | 62.5mA |
| Single Valve Class A | 350V | - | - | - | 60mA |
| Single Valve Class A | 300V | - | - | - | 50mA |
| Measurement Condition | 100V | 6900 | 580 | 4 | - |
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.
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