Filter cap question

[Rinkie & Ron Pollack]

When I get an old radio, I routinely replace the electrolytics for fear they
have dried out over the years.

My question is:  Does this only happen when the unit is unused?  I use most
of my old stuff, and have for years, and some still have the original caps.
I make sure everything is used for a few days every few months.  Will this
help them last longer, or should they be replaced periodically anyway?

Thanks!

Ron K2RP

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