The Labworks PA-138 Linear Power Amplifier is a high quality, air-cooled, direct-coupled audio amplifier primarily intended for use with small vibration systems. Although this amplifier has been designed to directly drive low impedance loads, it can be used in any application requiring continuous duty, high quality, audio power. A front panel switch allows configuring the output circuitry as either a low impedance voltage source or high impedance current source. A voltage-proportional-to-output-current output signal is provided for modal test and other applications requiring force monitoring.

PA-138 Amplifiers feature protection from both over current and over temperature ensuring long term reliability. The amplifier has full interlock capabilities as well as peak voltage and RMS current bar graphs to monitor output.