Construit par Pathé Fréres en 1918,ce phonographe est muni de 2 diaphragmes lisant avec un léger décalage le meme sillon d’un disque à saphir (90 à 100 tours pour les disques gravés à partir de 1905 puis 80 tours aprés 1916).Il donne un effet d’écho et évoque déjà l’idée du son stéreo cependant ce modèle sera un échec commercial en raison de son prix très elevé et de sa manipulation délicate.
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