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Hi Joe, My guess is that your brother's source of information is, generally speaking, the same as your own: He heard it from someone he believed. Think about it---now you are a source of confirmation that older Lincoln 225's have copper wound transformers. Your authority is based on your brother's possession of such a machine. Anyone who knows you to be an objective and truthful person will feel confident in passing that information along. But how, actually, does your brother know that his welder has copper windings? Probably because someone credible told him so---and besides, it's common knowledge. It's pretty unlikely that your brother has taken his welder apart to check what the transformer windings are made of. If he did happen to open it up to take a look he wouldn't be able to tell. The transformers in Lincoln buzzboxes are painted with a color of lacquer that used to be called oxblood. It would be easy to mistake it for copper. I buy and resell Lincoln buzzboxes occasionally, and I usually take them apart to clean them up and make sure they're sound. If there's an easy way to determine what the transformer windings are made of without damaging the welder, I don't know what it is, and I've taken them completley out of the machine and inspected them carefully. My source of information on the subject is e-mailing the engineer/historian on the Lincoln Electric website to ask if a particular welder, by serial number, had copper windings. The second time I did that, the e/h told me that that model had never been produced with copper windings. I'm sure that you and your brother will continue to believe that older Lincoln buzzboxes were made with copper wound transformers, and that your brother's got one. It won't do me a bit of good for you to change your mind about it, and it won't do me a bit of harm for you to go on believing it. It won't do you any harm, either. One thing I can tell you for sure is that I won't be making a trip to Texas to open up your brother's welder to settle the issue. As I said before, I wouldn't know how, anyway. All the best, Stan
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