The way it was explained to me is that the 250 and newer are all electronic and don't have contactors. Miller has been trying to get rid of contactor machines because they are more expensive to manufacture and don't last as long. Had the contactors go out on my vintage when it was 2 years old, just off warranty, cost $800.00 to fix. But that was when we were building racks for 4wheelers for Arctic Cat, Polaris and Honda. So the thing would do thousands of 1" welds every day. Miller tried to get me to use the 250's, but they would build up enough static charge between welds that it would stick the wire to the tip. The quality control on the Honda's especially made it so that wouldn't work.
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