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What is a Class A amplifier?
Class A power amplifiers are Class A power amplifiers. Two or two sets of output tubes in the output stage of the amplifier are always in a conductive state, and the conduction current state is maintained regardless of the presence or absence of signal input. This power amplifier has the best linearity, each output tube amplifies the signal full wave, basically no distortion.
The two currents in a Class A power amplifier are equal to the peak value of the alternating current, and AC flows into the load under the maximum signal condition. When there is no signal, the output tubes flow the same current and there is no unbalanced voltage or current at the output center, so there is no current input speaker. When the positive area of ​​the signal area starts to flow unbalanced into the speaker and push sound.
Class A power amplifier principle and circuit diagram:
Class A quiescent current is large, positive and negative half weeks are the current of a tube is changing, there is no distortion, low efficiency, good sound quality. The operating point of the Class-A amplifier's output transistor (or tube) is at the midpoint of its linear portion. Regardless of the signal level, the current it draws from the power supply is always constant, and it is inefficient. When used for audio amplification, the actual efficiency cannot exceed 25% due to the continuous change of signal amplitude, and it can be operated by single tube or push-pull. 
Class A power amplifier advantages:
1. Class A amplifiers have the advantage of no crossover distortion and switching distortion, and harmonic components are mainly even harmonics. The circuit is simple, frequency loan, and instantaneous distortion are small.
2, in the sense of hearing bass thick, soft and warm midrange, clear and neat treble, good leveling, very flattering. The actual application is not necessarily as beautiful as people think.
3. In any Class A power amplifier circuit under design, current negative feedback is perfectly compatible with nonlinear distortion and instantaneous intermodulation distortion, and has an ideal amplification effect.
Class A power amplifier disadvantages:
1. It has not been widely used in high-power amplifiers because of its high power consumption, low efficiency, easy heat generation, and high heat dissipation requirements. Due to the long-term operation of the device under high current and high temperature, reliability and life-time problems are easily caused.
2, and the high cost of the whole machine, so manufacturers of Class A power amplifier manufacturers are known, most have now stopped producing transistor A power amplifier.
Smart TV peripherals: What is a Class A amplifier? What are the advantages and disadvantages?
When we buy power amplifiers, many people will learn a little about the type of amplifier: Class D amplifiers, Class T amplifiers and so on. But many people have questions about another type of amplifier, Class A amplifier. What is this amplifier? Today, the author will talk about what a Class A power amplifier is and what advantages and disadvantages it has.