There is some nuclear evidence that the large stone (diorite, IMS) boxes found in chambers in Egypt were used as capacitors, especially the one in the Kings Chamber of the Cheops Pyramid. The entire Pyramid may have been an energy storage and calculated discharge apparatus. When the structure was covered with polished marble and the water channels below it running, it might have been a huge capacitor charging machine.
Well, lets leave this thread to finds and keeps that are real.