[TinCanAlley]

Originally Posted by old_tv_nut

That doesn't look like a non-polarized (NP) cap. The application requires non-polarized.

I can find some on Amazon, but I don't know
1) if the supplier is trustworthy
2) if the original part has some additional unique specification, for example, ripple current

Here are the ones on Amazon, which are advertized for audio crossover circuits, just FYI:
https://www.amazon.com/Cermant-Non-P...39&sr=8-3&th=1

It is non-polarized, but I no longer need it. I feel like I pay attention, but sometimes my outcomes say otherwise. I've been so focused on finding what blew on the video board, I completely ignored the reversed cap I removed from the power supply. I was cleaning out my old parts bin when I came across the one I reversed and then had to remove. While It looked fine, it was the source of the hiss and smoke. While the top was pretty flat, all the outside ends of the of the score lines had little pinholes in all four corners (video microscope helped greatly). So the pressure didn't bulge the canister or dome the top, it did blow out 4 little holes at the end of each score line.

Noting this, I put the supply back in and reinstalled the video board. It fired up just fine and performed all functions just fine.