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Vintage Miller SR series DC welders -- aka SR-600 SR-400

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  • Vintage Miller SR series DC welders -- aka SR-600 SR-400

    Does the SR in the name indicate that unit has a "Silicon", or a "Selenium" rectifier? or did they come with one or the other at some point.

  • #2
    Depending on the date of Mfgr. of the welder. Selenium Rectifiers were the first DC welders in the early 1950's. They were "sketchy" in a few years and overheated/leaked...replaced in the late 50's early 60's on up with silicon rectifiers. I believe ALL of the SR series welders were Silicon type.

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    • #3
      Hi rasommer, the SR does stand for Selenium Rectifier.

      Thank you,
      The Forums Team
      Miller Electric Mfg. LLC
      Last edited by Miller Welders; 06-12-2018, 04:08 PM.

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