a real challange?

[Yamamaya42]

Originally Posted by Notimetolooz

The mark on old vintage cylindrical caps indicated the lead connected to the outer layer of the foil. It is not at positive-negative polarity. In some situations it was thought the outer foil should be connected to the side of the circuit that is more closer to the signal ground (AC wise).
I have seen someone suggest you could determine the outer foil side of new capacitors by connecting one end at a time to a scope probe and hold the sides of the cap in your fingers. (Maybe you have to connect the other cap end to the probe ground lead.) The bigger signal (noise pick up) on the scope is when that end is connected to to outer foil end. I never tried that, but I see that it could work.
I don't think I ever thought it was necessary however.

I was using the term (negative side ) in a general sense as the chassis ( or ground ) is genitive in this set.
Example
https://imgur.com/KouQqr3
C85 C84 have outer foil side to gnd
https://imgur.com/T9pHSAI

Now, depending on who is asked :/ ( ask 4 people get 4 dif views, ) it may, or may not matter which way the new style film cap is put in.
some sources say it does not matter...
this says it does, :/
https://www.youtube.com/watch?v=BnR_DLd1PDI
mentions the o-scope test.
just wondering who to believe...