The phono cartridge is the ultimate source. The rest of an entire analog system is really a delivery system for one of these little wonders to do their magic.
A cartridge must be sensitive enough to transduce the slightest groove modulation and at the same time robust enough to track the cannons of the "1812 Overture."
Cartridge selection is the most critical choice when assembling an analog system. Let the experts at Sound By Singer show you the way.