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Did you measure the new caps to make sure you soldered them in the right direction (as explained by Mr Carlson Lab).
If you have been installing, orange dip, brown dip, green dip capacitors over the years, have you been installing them the right way? Even the little yellow ones have polarity in circuit.
That method doesn't necessarily seem useful because he's touching the part to make it do things that you don't want in the circuit.
The parts I've used are completely non-polarized and do not care which way you install them - AC will pass through either direction. The manufacturer doesn't mark the foil end because it's not important.
Old paper caps? Yes, that was important.
... edit: I'd suspect the method because you don't know how the part is wound or made. You could just be affecting the capacitance because the outer coating is closer in that area. You wouldn't know unless you removed said coating.
I know but it always triggers my OCD.
I did think about that but couldn't find any reason to check for that particular property with these parts, and I don't trust that method he's using.
Now, if I had something with +1kV on the plate, like the 1600VDC filters in a scope I have in the queue, sure. Those will be installed in a particular direction, even though they're only 0.1uF parts. 154VDC coming off the VR150? Yah, no need.
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