Preamplifier

Preamplifier is a type of electronic amplifier. That kind of amplifiers don't feed speakers because used power is smaller. Example preamplifier operates to use microphones small signal to grow example 2 Voltages.

Preamplifier makes a signal louder and stronger by using transistors or vacuum tubes.

Since the 1960s, most electronic amplifiers have been built with transistors. Transistors are lighter, less expensive, and more reliable.