those can type caps

The caps in metal cans all use the can as a common negative, with each of the other internal(to the outside ring) being separate positive terminals of separate caps. The ones with cardboard tubes usually have the common negative coming out as a black wire (sometimes from the opposite end) with the other color coded leads that are the positives.

It is possible, but the can is usually stamped with the values contained, and the symbol that is punched out of the phenolic wafer where the positive terminals exit, to tell you which section is which. One may have a square notch, one a triangle and one a half circle, for instance. Here are some examples of this type:

Thanks John.

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Hi John;

Just getting around to maybe relplacing a few caps. Is there any problem with mounting a cap like the JJ500V 50+50 (near the bottom of the link you sent me) on the outside of the chassis (as a replacement for and aluminum can cap)?

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I think it would work fine, as long as you can come up with a method to clamp it in place. That one does not appear to be twist tab mounted. I am assuming that both the chassis and the outside of the capacitor are both at ground potential.

Thanks John.

There is a mounting clamp about midway down the page that looks like it should be good for keeping it in place. I'm pretty sure that the chassis is at ground, but I don't think it would matter using the clamp, would it?

you

aluminum

I am just worrying about voltages you can touch, and if the cap case and the chassis have to be isolated from each other.