Hi Ivmax and welcome to the land of alembic.
No that shouldn't happen, one of the great things about alembics is how good they are at rejecting noise so that certainly is not normal. A few things you might want to try first is to make sure none of the components inside the cavity are touching the conductive sheilding paint inside. Also the knobs and switches are self cleaning so one of the methods recommend by alembic to try first is to "exercise them" which means turning the knobs about 30 to 50 times their full rotation to clean the conductive track inside. Also if you have switches , operate them again their full range the same amout of time. This seems to work successfully with a lot of noise or crackly problems with these basses, certainly they have with mine. I'm not knowledgeable enough about the electronics side to advise you further what to try but some of the more savvy electronics members will advise you soon and it might help to do a search on the forum for buzzing sounds and you might find something there to help.
