While the variable capacitors of yore invariably used intersecting vanes on a rotor, this one has two large parallel plates that intersect as one is moved over the other with a lead screw.

Why? Because electrolytic capacitors just don’t last, not the way most other components do, anyway. The metal terminal ring and the central plate are kept for re-use, and the metal case re ...

Water cooled capacitors are made up of two conductive plates separated by a dielectric material. The plates are typically made of metal foil and the dielectric material is usually a ceramic ...