Thanks for your suggestion. I tried with different cassettes. It seems to be always the same: it works for few minutes, than the “mouse” starts. If I stop the cassette, the noise goes on. To stop it, either I switch to another source, or I switch the Beocenter off. As soon as I can I will try to lubricate the motor bearings as suggested on the thread. Any suggestion to do that? Thanks you all, Luigi