Ah, who needs a replica when you could make the REAL thing.
The concept of the "flux capacitor" is very valid - before Einstein died, he was working on a theory that connected gravity with electromagnetism. If you can bend gravity, you can distort spacetime to create a differential. Based on dimensional trajectory into this differential, you can accelerate or reverse the timewave that keeps time flowing.
Flux is the field that is generated by an electromagnetic object. Flux can be contained within a metal suchas Iron - which is why a magnet attracts to an iron object.
The problem is you need an enormous amount of power to generate enough flux to even put a dent in spacetime - it's going to need to be stronger than gravity for an instant. With a capacitor, you could theoretically contain the flux being generated and release with precision. I would have to say it's going to take a superconductive material, such as a high grade inductive ceramic - supercooled. Mostly like an Alternating current will be used for progressive increases in voltage...