3 Added one of your comments, and made a couple minor formatting touches.
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This is a class B amplifier: -

enter image description here

Your circuit is a class AB amplifier: -

enter image description here

Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion: -

enter image description here

See also this article, thisCrossover Distortion in Amplifiers, for more information.

Rv modifies the volt drop across the two series diodes. Remember that diodes are not just fixed 0.7 v devices. The forward volt drop can be adjusted so that the base-emitter junctions of each output transistor are conducting 1 mA or so, placing the transistors in a much more linear region of their characteristic at the expense of a sending DC current thru the transistors (an increase in power dissipation).

This is a class B amplifier: -

enter image description here

Your circuit is a class AB amplifier: -

enter image description here

Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion: -

enter image description here

See also this for more information.

This is a class B amplifier: -

enter image description here

Your circuit is a class AB amplifier: -

enter image description here

Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion: -

enter image description here

See also this article, Crossover Distortion in Amplifiers, for more information.

Rv modifies the volt drop across the two series diodes. Remember that diodes are not just fixed 0.7 v devices. The forward volt drop can be adjusted so that the base-emitter junctions of each output transistor are conducting 1 mA or so, placing the transistors in a much more linear region of their characteristic at the expense of a sending DC current thru the transistors (an increase in power dissipation).

2 added 197 characters in body
source | link

This is a class B amplifier: -

enter image description here

Your circuit is a class AB amplifier: -

enter image description here

Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion: -

enter image description here

See also this for more information.

This is a class B amplifier: -

enter image description here

Your circuit is a class AB amplifier: -

enter image description here

Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion.

This is a class B amplifier: -

enter image description here

Your circuit is a class AB amplifier: -

enter image description here

Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion: -

enter image description here

See also this for more information.

1
source | link

This is a class B amplifier: -

enter image description here

Your circuit is a class AB amplifier: -

enter image description here

Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion.