Just thinking about, "The SB220 transformer was designed for a kilowatt INPUT DC, which was the legal input when it was designed. This was about 450 mA at about 2200 volts. It was...(etc)" If this is so, why should anyone ever have bought an SB-220, when the SB-200 was also rated at that exact same power, with a much lower price? 73, Roy K6XK