🚀 go-pugleaf

U>I am a beginner in this field. I heard that Class "A" 
U>amplifier is the best.

  Class A is `best' for low distortion.  However, it also causes the highest quiescent power dissipation.  To reduce power usage, there have been several techniques.
  Class B has two transistors, each controlling the positive and negative swings, but has bad crossover distortion.
  Class AB blends the two by having each transistor work into the other's region a little bit to compensate for the non-linearities as the other transistor is turning on.  It is the most common because of its combination of low distortion and low quiescent power dissipation.
  There are other classes of operation (one used Class A for small power and kicked in higher power transistors only at higher levels).
  Of course, there are different types of output devices that have different `kinds' of distortion.  Golden Ears audiophiles prefer electron tubes with `softer' distortion (which require transformers) and Power FETs, which have similar distortion to Tubes but don't require transformers.

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Jeff Lindstrom
Internet: Jeff.Lindstrom@ofa123.fidonet.org
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