I am wondering what the construction of these units is like. One area in particular is circuit boards. I have done quite a bit of electronics troubleshooting/repairs on amatuer radio equipment and power supplies and various other equipment. Are schematics and parts lists available for these units? What type of component construction is used on these units? Surface mount or thru hole or combinations of both? I am considering the analog 225LX and 250EX tig machines. I recently worked on a Miller 625 plasma torch and found pretty much a one circuit board unit. No schematic was found [or offered] after quite a long search. The cheapest circuit board price was 900.00 on that one. You would be surprised at how cheap some electronics can be repaired. Many that cannot be repaired are due to manufacter specific IC's that become obsolete almost immediatly. The Miller fiasco sort of generated my curiosity. No offense intended here. I just like to consider all options. I am what some would call a jack of all trades, master of none. I like to tackle just about anything that needs repair.