Dsper,
Cartridges do not go bad. It either works, or it doesn't. It is the stylus or its cantilevers suspension that wears out. Both get replaced when you install a new stylus replacement. There are no moving parts in a cartridge so there is nothing to wear.
Cartridges do not go bad. It either works, or it doesn't. It is the stylus or its cantilevers suspension that wears out. Both get replaced when you install a new stylus replacement. There are no moving parts in a cartridge so there is nothing to wear.