A cartridge output could decrease for several reasons. Among these:
As the cartridge ages, the material used to suspended the cantilever could lose elasticity and limit the motion. This would cause a decreased output since output voltage is proportional to amount of motion.
Another reason would be that either the magnets have decreased in strength or that another part of the cartridge has become magnetized in a manner that offsets the original magnets.
In any case, cartidges have a limited useful life. Any idea how old the cartridge is or how many hours?
As the cartridge ages, the material used to suspended the cantilever could lose elasticity and limit the motion. This would cause a decreased output since output voltage is proportional to amount of motion.
Another reason would be that either the magnets have decreased in strength or that another part of the cartridge has become magnetized in a manner that offsets the original magnets.
In any case, cartidges have a limited useful life. Any idea how old the cartridge is or how many hours?