...

Well, i don't think your old CTC-53 is RoHS compliant :lmao:

But even long before RoHS came along, they did use pure tin or zinc to electroplate sheetmetal parts, and those metals are highly prone to grow whiskers

Good day, Gentlemen,

All you want to know about metal whisker growth; frightening!

http://74.125.39.104/search?q=cache:ogIYdx7c0YYJ:nepp.nasa.gov/WHISKER/other_whisker/index.htm+%22whisker+growth+in+metals%22&hl=fr&ct=clnk&cd=3&gl=fr

Best Regards

JH