I had a very lengthy conversation with Tim Jarman of HiFi News who set up the following website:
https://beocentral.comIn the conversation I had with him at the High End Show in Windsor he said that the B and O cartridges were a brilliant design as they were conceived with a view to be put into the parallel arms found on the 4000 range of decks. As such they have a very small stylus. B and O apparently considered all parameters when designing the decks - arm/drive/cartridge as opposed to each part in isolation.
Now I am somewhat expanding this thread, but pivoted tonearms are inherently flawed as they follow an arc - so there is always a tracking error - most cartridges are designed with conventional pivoted arms in mind. Hence cartridge architecture originates from this. Parallel is the way records are cut and should be they way to go, but compliance matching appears to be an inherent problem (I am sure many will disagree). Anyway it was with this in mind that the B&O arms and cartridges were designed all of piece so to speak.
So returning to the issue my intrigue has drawn me to getting a B&O 4002 which I am getting serviced along with the mmc20en cartridge - lets see if the theory is true...