Differences between Class-A, Class-B, and Class-A/B amplifiers

Amplifiers can be designed in different ways and are therefore categorised by so-called “classes”.

Below you find a comparison table to outline the major differences between the three most common analog amplifier classes. You may rest assured that all our tube amplifiers are solely using Class-A and Class-A/B designs to provide you with the best audio experience possible. 

Class-A

Class-B

Class-A/B

Sound Quality

Best

Worse

Very good

Power consumption

Worse (~20% efficiency)

Best

Medium (~50% efficiency)

Linearity (linear amplification across the whole frequency spectrum)

Best

Worse

Very good

Distortion

Lowest

High

Low

Remarks

Best sound quality but usually less power (Watt) due to high power consumption and heat emission.

Belongs to the “top 10% in the high-end audio market”

Not recommended for usage in audio applications

Very good sound quality paired with acceptable efficiency (means more power to drive your loudspeakers).

Dominates the audio market

 

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