My secondary system is 45 years old.(Marantz receiver, Rotel Cd Player, Braun Speakers and a newer Rga TT). All vinyl sounds great yet on some cds there is an intermitant crackle on some tracks. The cds are fine as have tested them on my primary system. Also, the crackle seems more apparent near end of the disc. Thinking it could be the player, but maybe the amp. having a friend bring his player over to see if all is good with his. Then it would be my player. My question could it also be the cd output from the receiver as vinyl is fine?