There are a striking number of passionate people in our industry, both on the manufacturer and user side, who talk about their work with glowing eyes. In the vast majority of cases, I look for my interlocutors on the user side, but it's not always so easy to tell user and developer apart, because there are also contemporaries who - for good reason - are on both sides. One of these audio enthusiasts, who enjoy the privilege of being able to build the equipment they would like to use themselves, is called Ruben Tilgner and is the owner of the German analog equipment specialist elysia.