Amplifier Research 25A250A

The Amplifier Research 25A250A is a self-contained, broadband solid-state RF amplifier engineered for laboratory and field applications requiring instantaneous bandwidth, high gain, and moderate power output across a wide frequency spectrum. Built on push-pull MOSFET circuitry, it delivers reduced distortion, enhanced stability, and unconditional load impedance tolerance - operating without damage or oscillation regardless of load phase or magnitude.

Technical Specifications

• CW output: 35 W nominal, 25 W minimum


• Linear @ 1 dB compression: 15 W minimum


• Third order intercept point: 54 dBm typical


• Harmonic distortion: −20 dBc maximum at 15 W Frequency Response


• Operating range: 10 kHz to 250 MHz instantaneously


• Flatness: ±1.0 dB maximum Gain


• Maximum setting: 44 dB minimum


• Adjustment range: 18 dB minimum continuous


• Input for rated output: 1.0 mW maximum Impedance & Connectors


• Input impedance: 50 Ω, VSWR 1.5:1 maximum


• Output impedance: 50 Ω nominal (VSWR 2.0:1 maximum)


• RF connectors: Type N female Noise Performance


• Noise figure (above 1.0 MHz): 6 dB typical Power Supply


• Input voltage: 90–135 VAC or 180–270 VAC (autoranging)


• Frequency: 47–63 Hz, single phase


• Maximum consumption: 200 W


• Switching architecture with universal input acceptance Physical


• Dimensions: 50.3 × 15.5 × 30.0 cm


• Weight: 15.9 kg


• Cooling: Forced air circulation

Key Features

• 100% mismatch tolerance - delivers full rated power into any load without foldback


• Faithful reproduction of AM, FM, and pulse modulation


• Broad instantaneous bandwidth eliminates tuning delays


• Compact benchtop form factor with forced-air cooling

Typical Applications

• RF susceptibility testing


• Antenna and component characterization


• Watt meter calibration


• Driver stage for higher-power amplifier systems

Compatibility & Integration Type N female connectors ensure standard RF integration. The 50 Ω input and output impedances match laboratory instrumentation and test fixtures. Universal autoranging power supply accommodates worldwide mains voltages without configuration.