Phono MC input: turntable with MCpickups (moving coil pickups) deliver only an extremely low output voltage of 0,1 to 0,5 mV - a normal one high level input delivers 100 to 500 mV. Therefore, this turntable connection requires a special, highly sensitive preamp, the phono preamp (see phono preamplifier) with its own input.
Depending on the type and output voltage of the pick-up system Phono MM input and phone-MC input distinguished. A good amplifier has a switch between MM and MC for the phono input.