[Nuvistor]

Originally Posted by greg_simons

I'm sure this is old ground for many here but tin whiskers isn't dependent on use or not, nasa did a lot of research on this problem and found even new unused stock of some semiconductors suffered, the info's still on their website along with highly magnified pictures, makes very interesting reading.
Greg.

Information much nearer to home.
https://www.vintage-radio.info/whiskers