On May 16, 2016 12:59 AM, "Paul Anderson" <useddec at gmail.com> wrote: > > I think the main difference is the H7420, which is the newer of the two, > can handle more current. > Also, the h7420a is infinitely easier to work on, one just pops open the panel and the board folds out. The h742a is a bear to get to. Bill