Class A power amplifier: The power amplifier tube remains in a conducting state throughout the entire signal cycle, resulting in low distortion but low efficiency and high heat generation. Now only a few people are playing.
    Class B power amplifier: A pair of power amplifier tubes conduct respectively in the positive and negative half-cycles of the signal. It has high efficiency but is prone to cross-crossing distortion. High distortion has been phased out.
    Class A and B power amplifiers: Combining the features of Class A and Class B, the power amplifier tubes are on for most of the signal cycle, balancing efficiency and low distortion. It still has a considerable market share now.
    Class D power amplifier: It achieves amplification through high-frequency pulse width modulation (PWM), featuring extremely high efficiency and low heat generation. It requires demodulation to restore the signal. The sound quality and tone are increasingly becoming mainstream technical products.
    Class H power amplifier: It is a type of power amplifier whose amplification circuit part has the same principle as Class AB power amplifiers, but whose power supply part uses a switching power supply with adjustable multi-level output voltages. It can automatically detect the output power and select the power supply voltage.
    Class G power amplifier: It is an improved form of Class AB power amplifier with multiple power sources. Its amplification principle is the same as that of Class AB. The power supply part adopts two or more sets of voltages. It uses a low voltage during low-power operation and automatically switches to a high voltage during high-power operation. Its efficiency is higher than that of traditional Class AB power amplifiers.
    Class K power amplifier: It integrates an internal self-lifting voltage boost circuit and various power amplifier circuits. Different power amplifier circuits such as Class D (high efficiency) or Class AB (good sound quality) can be selected as needed to meet different requirements.
    Class T power amplifier: Its principle is the same as that of Class D power amplifiers, but the signal part adopts DDP technology. It features high efficiency and low distortion, and its sound quality can rival that of Class AB power amplifiers.
    TD class power amplifier: The amplification part operates on the same principle as AB class power amplifiers. The power supply part adopts a completely independent high-precision adjustable digital power supply with stepless output. It automatically detects the power to adjust the voltage and is mainly used in high-end audio equipment.
    Class C power amplifier: Also known as Class C power amplifier, the transistor conduction time is less than half of the signal period, and it is mostly in the off state. It has relatively high efficiency, but the distortion is very serious. It is generally used in wireless communication, power converters, FM broadcasting and other fields, and is not suitable for audio amplification.