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In my limited experience, I've found there's generally two things that go wrong with all 57s, either:
-the leads came undone from the transformer
-or-
-the very thin copper leads have detached from the diaphragm.
I have found the former problem is easy to fix while the latter is, for the most part, unfixable. At best, its a big waste of 'time vs. fix'.
Unscrew the main part of the body towards the XLR.
Look inside. If there is a wire loose, reattach and try the mic out.
The other thing to consider with old dynamics is that the diaphragm will dry out over the years. I have never seen a 57 (or its variants) have a bad transformer....
The policy I was aware of was that shure will replace broken 57s for about 65 bucks if you send them the broken mic.
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