What Are the Differences Between Class A, B and C Amplifiers?

In audio electronics, class amplifiers are symbolized by letter symbols only. However, the class gives a broader idea of an amplifier's features and performance. In general, there are three classes. They are B, C and D. The amplifiers belonging to the class A are characterized by their capability of throwing out more sound than the others. On the other hand, it has been noticed that the D amplifier is only used when there are low level signals. See page and learn  how to build a guitar amp quickly.

Class B - These amplifiers use a combination of high order crossover network and moderate distortion for the sake of efficiency. There are six high frequency phases. The output stage consists of five tubes which are operating in a notch circuit. The D amplifier uses five diodes in the output stage, whereas the C uses two diodes. The efficiency of Class B amplifier is not as good as the Class A amplifier.

Class C - The Class C amp includes additional controls that allow controlling the operation of the output transistor. Due to its higher efficiency, the distortion of Class C amplifiers is almost half than that of Class B amplifier. The output is conducted through six transistors. On the other hand, the distortion is almost non-existent in Class D amplifiers.
Class D - The Class D amp is designed with very low distortion but with better power supply efficiency. The D amplifiers can handle the power requirements of even the largest subwoofers and bass sound. Class D amplifiers have a switching power supply system and they usually have an added buffering stage. They have high efficiency and long voltage stability.
The advantages of using the Class D amplifier class is that they can operate on lower voltages. It also has better power output than the Class B amplifier class. This amplifiers do not need any phase conversion. It has full direct current capability and the output voltage is always linear. The Class D has a similar topology to Class A and B.

The  amplifier classes A, B and C include the same basic design in that the output devices are connected in the same fashion but Class A includes one half as many pins and B has one quarter. The output devices in Class A are always connected in parallel. The waveform of Class D refers to the difference between the high and low order of the product voltage. For more enlightenment on this topic, click at: https://www.britannica.com/technology/amplifier.