Best cartridge for Breuer 8C

....any of the wood or stone bodied Koetsu cartridges (I have used the Urushi and Onyx) – a musical and luscious sound field, very lovely. The Lyra Titan also works well (if not a bit on the analytical side).

Those are certainly a good starting point.

I used an onyx Koetsu with my Breuer and it was fine. Also tried a Lyra
argoi and it worked fine.
Joe

I've owned several Breuer tonearms and visited with Mr. Breuer in his shop and his home in Switzerland many years ago when I brought limited numbers of them into the USA.

The Breuer tonearm was originally designed to operate with a modified EMT fitted with an aluminum cantilever and custom Van den Hul diamond.

I owned several Breuer EMT cartridges, they are very dynamic but difficult to set up properly and loading is hyper critical. Back in the day I got good results with Dynavector cartridges but I've have not heard newer (such as XV1s) mounted in a Breuer.