Quote:
Originally Posted by old_coot88
First off, those coil forms that Zenith used tend to crystalize from heat and fall apart after a few years. If yours haven't fallen apart, the set is probably very low time. Also, concerning one of those blue coils (forget which one, been a lotta years), if you run the slug too far out (or if the slug is missing), it will fry one of the wirewound pots. This is probably what's happened in your case.
For that stripped slug, you could take a very thin strip of rubber from a bike inner tube (but not a gum rubberband which will rot) and lay it full length inside the form, then push the slug in. The strip will provide a friction fit and you can still adjust the slug as needed.
You might consider a small muffin fan to keep the conv. board cool, to slow deterioration of those coil forms. BTW, RCA conv. boards will also smoke a pot if one of the blue slugs is turned too far out. A little tidbit worth bookmarking. Bill(oc)
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I ended up destroying the coil, but was able to find another coil (diff winding) which I removed all the old windings, so I just had the form. Then I removed all the old wire from the messed up coil and rewound on to the donor coil form. Put it all back in and it works great. The donor coil form plastic is in much better shape and the slug moves very smoothly.