Normally, the suspension will fail before total wear of the diamond tip. The suspension hardens with age and induces all sorts of negative effects: distortion, bass-lacking sound and the needle itself might fall off.
I have only encountered one of five original MMCx cartridges that still work. When (not if) the cart fails, you have the option of re-tipping at Axel Schürholz (http://www.schallplattennadeln.de/). He offers great quality replacements and most Beogram users in here have positive experiences with him, including myself. Service is great and your cart will be good for another 20 years ![Smile](http://forum.beoworld.org/emoticons/01.gif)
Beocenter 9300, Beogam CD50, Beocord 5500, Beomaster 3400, Beomaster 4400, 2 Beogram 4000, Beomaster 8000, 2 beogram 8002, Beovox S-75, Beovox MS150.2, Beovox RL6000, Beovox S-35, Beomaster 6000, 2 Beocord 9000, Beocord 8004, Beocord 5000, Form 1, 2x Beolink 1000, Beo4, MX3500, LS4500. Born 1993.