Welcome to the forum.
Sadly, B&O no longer supports their turntables. We have to look elsewhere.
Here is a link to the manual: https://www.vinylengine.com/library/bang-and-olufsen/beogram-rx2.shtml
First off remove the top platter and lightly place your finger on the sub platter with the motor running to determine if the belt is slipping or the motor is slowing. If the belt is slipping remove it and measure the length. Assume it has stretched and reduce the number by ~ 5%. Measure the thickness and width if it is a flat belt or the diameter if it is round. With those numbers call Gary at Voice of Music. http://www.thevoiceofmusic.com/
He may be able to Help you. He may even be able to work from the model number of your machine.
If the old belt is not slipping, but rather the motor is slowing, some trouble shooting will be required.
msp1 wrote:I'm new to the forum, and have a B&O RX-2 that "drags" each time the tonearm drops. I'm not finding much in the way of reliable sources online for a replacement belt. One of the websites (turntablebasics.com) calls for a 29.5" belt (out of stock), which differs from most other models. An EBay seller lists a 27.3" belt to fit all these models --1800, 2000, 2200, 3000, 5000, RX-2, which contradicts the other site. Before I pull mine apart, possibly risking the old (original )belt integrity without a replacement in-hand, does anyone know where I can find the proper belt length? It's not spec'd in the service manual, just "belt" and a part #. Also, any ideas where to find a good belt?