high freq for dc250 lincoln

Hi, I have a dc250 lincoln cc/cv welder that i'd like to hook up a K799 or older "high freq" unit on for TIG. But while looking at an owner's manual for a Lincoln "high freq" arc starter it said something about needing a bypass capacitor kit for the welder. I was wondering if anybody could enlighten me about this. I thought all i needed was the arc starter at first but now i'm not sure. Also how would i tell if the welder had this kit already, if in fact i do need it. Any help or comments would really be appreciated. Thanks