50% is on the record. It contains only vertical information, when it is stationary. The turntable provides all the time-domain information, as it spins the record under the stylus.
In addition to the time-domain issue, the turntable provides some other extremely important attributes, without the proper function thereof, the cartridge cannot work up to its capabilities. This would relate to the main bearing's ability to maintain stability in the lateral plane. If the main bearing allows movements to occur within it(from vibration or other sources), the platter can be moved microscopically laterally, and therefore influence the critical juncture of the record/stylus contact. The record information contains modulations on the order of angstrom measurement. If the main bearing allows the platter to move, even slightly laterally, this will cause some of the record information to pass under the stylus without deflecting it(therefore losing information), or cause the record information to pass under the stylus and deflecting it too much(therefore causing overmodulation). Both of these conditions cause our cartridge to not perform as intended, regardless of how great the cartridge is, or how perfectly it is matched to the arm. No turntable does this function perfectly, as yet. The better turntables will allow the cartridge/tonearm combination to perform at a better level, because they are presented with the record information from the groove in a more stable manner, both vertically, horizontally, and in the time domain. Without this proper stability of the record groove, no stylus/cartridge can work at its best, and therefore will perform at less than what was intended. To get the best information retrieval from any cartridge you select, the record groove must be passed under the stylus with the most stability possible, in all three planes: vertical, horizontal, and time-domain(speed). Then the tonearm and cartridge combination can begin to do their work properly. Without this, they will never even approach their potentials. And this is why the turntable must be considered primary in the order of importance in the analog chain. Notice I did not say that it is the only important thing. Simply that the foundation must be laid before the roof goes on.
In addition to the time-domain issue, the turntable provides some other extremely important attributes, without the proper function thereof, the cartridge cannot work up to its capabilities. This would relate to the main bearing's ability to maintain stability in the lateral plane. If the main bearing allows movements to occur within it(from vibration or other sources), the platter can be moved microscopically laterally, and therefore influence the critical juncture of the record/stylus contact. The record information contains modulations on the order of angstrom measurement. If the main bearing allows the platter to move, even slightly laterally, this will cause some of the record information to pass under the stylus without deflecting it(therefore losing information), or cause the record information to pass under the stylus and deflecting it too much(therefore causing overmodulation). Both of these conditions cause our cartridge to not perform as intended, regardless of how great the cartridge is, or how perfectly it is matched to the arm. No turntable does this function perfectly, as yet. The better turntables will allow the cartridge/tonearm combination to perform at a better level, because they are presented with the record information from the groove in a more stable manner, both vertically, horizontally, and in the time domain. Without this proper stability of the record groove, no stylus/cartridge can work at its best, and therefore will perform at less than what was intended. To get the best information retrieval from any cartridge you select, the record groove must be passed under the stylus with the most stability possible, in all three planes: vertical, horizontal, and time-domain(speed). Then the tonearm and cartridge combination can begin to do their work properly. Without this, they will never even approach their potentials. And this is why the turntable must be considered primary in the order of importance in the analog chain. Notice I did not say that it is the only important thing. Simply that the foundation must be laid before the roof goes on.