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Joined: Apr 2018
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As per Professor Shadow try using isopropyl alcohol that is at least 90%-100% alcohol.. I did that and it worked for me. On the line cards I set them in a bowl with the isopropyl alcohol over night and that did the trick.

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Set the wayback machine!
https://sundance-communications.com/forum/ubbthreads.php/topics/484140/1

I would have thought it was a wax capacitor leaking but that seems too obvious

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Of note: I added some extra info about these relays to that link Noobed2336 just linked to above:

  • A Western Electric document, dated 1979, describing the internal details of the 327 type relay, and its many revisions, and mentions the potting compound that is the likely culprit
  • Some entertaining photos I took while de-soldering a 327A / 72K relay from one of my old 400D cards, and the gooey results of its innards!


I added some other details there.
The relay seems to hold a large amount of this goo, probably on the order of a shot glass or so.

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