A memory circuit having features specifically adapted to permit the memory circuit to serve as a video frame memory is disclosed. For the manufacture of such an assembly, a device is used for filling with casting compound and which includes a mounting for securing the assembly in a position which permits air to escape from the casting gaps, which have an external connection during filling. with a T10 point greater than 205\xb0 C. An upper part of one of the flanges accommodates a shaft which supports an end fitting. , adjusting the tension in the web material.