Post by G. BeatPaul Pinyot, KB3LZP (SK, 2013) covered SW receiver repair, due to silver mica disease,
over a decade ago with a number of repair photos.
Sadly, that web site http://www.ppinyot.com is now gone.
Wayback Machine has a snapshot (2013) of that web page (Requires time to Load)
https://web.archive.org/web/20131127021951/http://ppinyot.com/if_transformers.htm
Last date saved appears to be December 19, 2016:
https://web.archive.org/web/20161219131433/http://www.ppinyot.com/if_transformers.htm
I recommend going to the latest date you can get a complete site...
The index page of his site is (2016/Dec/03):
https://web.archive.org/web/20161203041655/http://www.ppinyot.com:80/
John :-#)#
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