I just got a Lincoln Square Wave TIG 275 that looked in as new condition. I had used it for about a week in TIG Pulse both AC and DC and it worked perfect. I needed to run some 7018 so i got needed cable end and found it would only run "wide open" in stick mode. I set up again for TIG and it worked as it should. I guess i will now do any stick work with my Lincoln 300/300 and just use this 275 for TIG. Any ideas on what the problem might be or where to look? I had double checked all settings and it is not something as simple as this. I'm in southwest Va. if you know any good Lincoln service people in this area. Thanks.
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