The M6s PRE from Musical Fidelity belongs to the family of solid stereophonic pre-amplifiers. The pre-amplifier is a device that "normalizes" the signal from the respective source (cd/dvd player, turntable, radio, etc.), so that it can be accepted by the final or integrated amplifier and reproduced by the speakers. In this case, it operates with transistors or otherwise solid state. It has a phono input.