60 line experimental set used by universities and for research. It had only 8 tubes. The Visiodyne was built by French TV pioneer Marc Chauvierre. He was an early adopter of new technology and tinkered a lot. The Visiodyne was sold as a kit, very few were made as there was not much to watch back then and the French kept changing their lines standards, so the major electronics manufacturers decided to wait until a line standard was set upon before manufacturing in any quantity. The war interrupted the process before anything was decided, hence the unbelieveable scarcity of true pre-war French electronic sets. (Information thanks to Jerome Halphen)

The museum has a CRT for this set in its collection. Here is a replica made by French collector Collector André Chompret.