The amplifier is responsible for delivering enough electrical current to your speakers, without destroying them. The world’s best speakers will do nothing to hide poor amplifiers. An amplifier takes the electrical wave form and elnlarges it without changing the waveform. Its main job is to boost the signal enough to drive the speaker.
The solid state amplifier uses lots of transistors to boost the signal to the speakers and make up more than 90% of the amplifier sold today.
A second is the vacuum tube amplifier. This type uses vacuum tubes to amplify the signal received. Tube amplifiers generally have a particular warm sound, very relaxed and strong in the mid-range.
