Stereo amplifiers are considered to be the workhorses of stereo systems. The amplifier is designed to deliver electrical currents to the speakers without destroying them. It boosts weak audio signals, turning them to more powerful signals that can be driven out by the speakers. It consists of a power supply, an input stage that takes in the audio signals, a driver stage that amplifies the signals, and an output stage where the signals are transmitted to the speakers through a speaker cable.
A solid state or a transistorized stereo amplifier uses several transistors or little integrated circuits to amplify musical signals. It is the amplifier of choice of most audio and music enthusiasts, taking up more than 90% of the market. It is compatible with most types of speakers. It has a strong bass, exhibiting low-frequency performance. A cheap and poorly designed model usually produces harsh and grainy upper registers, causing distortion, high-frequency sound, and listening fatigue.
Vacuum tube stereo amplifier
A vacuum tube stereo amplifier is also known as a tube amplifier. It is the older type of amplifier. It uses a vacuum tube to amplify signals coming from a preamp device. It is made in a limited quantity and sold at a higher price than a solid state amplifier because of its high material and manufacturing cost. It produces a tube sound that is warm, mellow, and very relaxing to the ears, usually playing in the mid-range. The bass sound it produces is not as strong as the one in a solid state model.
Portability: Since a stereo amplifier is heavy and difficult to move, choose one with a handle on top or several handles along the sides for movability and portability. For easier transporting, look for a model made with wheels.
Power: For home use, choose a stereo amplifier that uses eight to 15 watts of power connected to a single six- to 12-inch speaker. For auditorium or concert hall use, look for one that uses 25 to 50 watts of power.
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