power amplifier

Abbreviated as a power amplifier, it is an electronic device used to enhance signal power to drive the speaker to produce sound. A power amplifier without auxiliary functions such as signal source selection and volume control is called a rear stage.

Preamplifier

The pre amplification and control section before the power amplifier is used to enhance the voltage amplitude of the signal, provide input signal selection, tone adjustment, and volume control functions. A preamplifier is also known as a preamplifier.

Combined amplifier

An amplifier that combines preamplifier and power amplifier into one chassis.

Bile machine - another term for electronic tube amplifier.

category

The conductive methods of power amplifier tubes in power amplifiers can be divided into Class A (Class A), Class B (Class B), and Class A and Class B (Class AB).

Class A

Also known as Class A, it is a type of amplifier in which no power output component of the amplifier experiences current cutoff (i.e. stops output) throughout the entire cycle of the signal (two and a half cycles of the sine wave). Class A amplifiers generate high heat and have low efficiency when working, but their inherent advantage is that there is no crossover distortion. Single ended amplifiers all operate in Class A mode, and push pull amplifiers can be either Class A, Class B, or Class A or Class B.

class B

Also known as Class B, the positive and negative half cycles of the sine signal are amplified and output by two "arms" of the Push–pull output stage in turn, and the conduction time of each "arm" is half a cycle of the signal. The advantage of Class B amplifiers is their high efficiency, while the disadvantage is that they may produce crossover distortion.

Class A and B

Also known as Class AB, it is located between Class A and Class B, and each "arm" of push-pull amplification has a conduction time greater than half a cycle of the signal but less than one cycle. Class A and Class B amplifiers effectively solve the problem of crossover distortion in Class B amplifiers, and their efficiency is higher than that of Class A amplifiers