Miller Dialarc 250 DC stick welder,Rectifier Problem,Needing some info Please 03-18-2009, 08:13 PM. Hello,I have a Miller Dialarc 250 AC/DC stick welder,had some problems with it and found the problem with it,in Between the Rectifier above the Fan (3-Plates) the Brass contacts thats between the plates thats soildered are Burned up,i took apart ...