Our 2003 Rialta QD has had a failure in the converter unit. It has failed to the point of no repair according to my elecrical engineer friends. When I tried to buy a direct replacement, I found the Magnatec 7400 series was no longer in production or available through normal channels. I did find an updated converter with additional benefits and for less money than the last posted price for the Magnatec. The specs are superior to the Magnatec. It is called a PowerMax PM4B-45. Contact me for more info.