Abstract: A 2.5 kW,352 MHz unconditionally stable RF amplifier for CW and pulsed operation has been built and tested at Legnaro National Laboratory,Italy.The amplifier is made of 9 modules,each containing one push-pull 350 W MOSFT equipped with a circulator and a RF termination.High efficiency,linearity,reliability and low cost are the main features for this device,which is developed for intermediate beta,independently phased superconducting cavity linacs.Technical characteristics and test results are presented.