Kenwood PS-40 Kenwood is pleased to announce a new switching power supply, model PS-40. Rated at 23 amps, a size similar to the TS-50S, and weighing 4.5 pounds, the PS-40 is ideal for use in the home or on the road. The primary input voltage is easily changed from 115V to 230V by an external switch - great for trips abroad. The PS-40 is the result of Kenwood’s demanding requirements for high reliability, low noise, and the desire to have a companion supply for the TS-50S.