I just bought a Super Angulon 165mm from Germany. The lens is in a Compur Electronic 3 shutter. I have been told that these shutters are not reliable and can't be repaired. They run on an old 4.5v mercury battery but can be converted to CR123 with an adapter. I have 3 other lenses in Copal 3 mechanical shutters, so I could put the 165 SA in one of these some time in the future.
My experience with electronic shutters is limited to a Bronica GS-1. The Bronica lenses had a Seiko 0 electronically time shutter that was controlled from the camera body. These shutters never failed, were accurate and were silent during long exposures. I think the Seiko was designed in the early 1980's while the Compur Electronic shutters were designed in the 1970's or earlier. Have circuit boards, integrated circuits and solid state devices changed in that decade or so? The principles that guide an electronic "escapement" aren't that complicated I would think and therefore should be repairable or even replaceable. But I am an optimist and did have some electrical engineering training many years ago.
Bookmarks