I picked up a Toshiba laptop switching power supply for my K2 on ebay. It's model PA2450U, and has a rated output of 15V 3A. On the K2, full-power key-down into a dummy load gives a reading on the display of 14.1V and 2.5A with a good clean tone. I paid $20 plus shipping for it. 73, eric K2 #432