As some of you might know i start building a tonearm especially for this cartridge i have from a disabled beogram 2202.During my trials i found that i could use a magnet for helping me attach the cart to the arm . At first i tried a small disk 3.5/ mm diameter magnet and then i wanted to try some more powerfull one , made out of two magnets from a dvd optical pickup, almost the same size as the back cut of the cartridge and 5 mm thick .
Given the internal geometry of MMC carts which is not entirely clear to me, but looks almost like it has a magnet placed at the back, how would you think my external magnet placed at the back of the cartridge be affecting the cart's specs? I tried to get an answer on this on beoworld site, but it looks like nobody's tuned into my curiosity...Most probably what we see at the back of the cart isn't the cart's magnet so if it's the metal closing the magnetic circuit, my magnets won't be able to interact with the cart's magnet field, but even if it does how will it do it?Will it decrease the cart's magnet field or increase it?
Unfortunately i am not allowed for the moment to upload any images on the site...I have no idea why.
Given the internal geometry of MMC carts which is not entirely clear to me, but looks almost like it has a magnet placed at the back, how would you think my external magnet placed at the back of the cartridge be affecting the cart's specs? I tried to get an answer on this on beoworld site, but it looks like nobody's tuned into my curiosity...Most probably what we see at the back of the cart isn't the cart's magnet so if it's the metal closing the magnetic circuit, my magnets won't be able to interact with the cart's magnet field, but even if it does how will it do it?Will it decrease the cart's magnet field or increase it?
Unfortunately i am not allowed for the moment to upload any images on the site...I have no idea why.
Last edited:
I thought i should try them first just because they migt have the best experience with B&O equipment...
Modern magnets are very strong, it could easily saturate the iron from the cartridge, making it deaf.
Keep all magnets and magnetic materials (including steel screws and nuts) far away from the cartridge.
I thought that given the mmc cartridges operate a bit different than the mm carts relying on internal magnet to provide the necessary field it need to be interrupted by the cantilever's cross.As mmc20en has lower output than a simillar mm cart i thought it could only beneffit from a stronger manetic field.Anyway the back metal piece is behaving like a shield so the external magnet field might not be able to pennetrate the cartridge interior.I can remove now the magnet as i modified the tonearm accordingly.