[AMRadio] old round aluminum filter Capacitors


Jack Schmidling jack at schmidling.com
Wed Nov 1 10:44:00 EST 2006


John E. Coleman (ARS WA5BXO) wrote:
> What was in these things?  The inside of the can is lined with a perforated
> brittle screen perhaps some carbon stuff. The center post is connected to a
> foil which is wound in a spiral.  I don't think it is laminated foil?

Not sure just what you have but electrolytics are/were made by a process 
that produced the dielectric when fired up.  The foil was uninsulated 
and immersed in a chemical soup that coated the foil with a very thin 
layer of dielectric when activated.  It's electro/chemical magic.

js


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