Original poster: "Borislav Trifonov" <bdt-at-shaw.ca> How do I determine the proper PFC cap, or if I even need one, for a MOT? Mine has been modified by removing the magnetic shunts and reassembling the laminations so that they are interleaved, so I don't know how that affects the usual numbers used. I don't know how to measure PFC and I don't have a scope.