Well, now I played it plugged in to anything at all and I could hear that it sounded the same, so I guess its the cartridge. Or could it be some other problem? For example, the disc is spinning pretty bumpy, could this bi it or is it just the way vinyl works?

Hello B&O experts! I've got an Beogram 5500 which doesn't really sound as it is supposed to. There are lot of disturbance noises, especially from the bass. It also eventually skips parts of the songs. Here is a link to a small recording I did so that someone maybe could help me easier: http://rapidshare.com/files/85462045/my_beogram_5500