I have a couple of this kind, plus a "Bakosonic", that's basically the same thing with few minor (mostly aesthetic) differences. Afaik Broksonic has an office in some city of USA (can't recall what city), but probably the Korean factory produced for many other customers, with different brands.
well it's still loaded with wow & flutter. could be a low quality pre-recorded tape. try dubbing the radio onto a good quality blank cassette & see if that helps.