How could I calculate the voltage gain Av for the following power amplifier diagram?
Here there is an example how to find it but the schematic doesn't use current sources and use the voltage drop on collector resistor of the differential stage:
http://www.ecircuitcenter.com/Circuits_Audio_Amp/Basic_Amplifier/Basic_Audio_Amplifier.htm
Answer
The gain of such amplifiers is governed almost exclusively by the feedback. The open loop gain is deliberately much higher than the ultimate closed loop gain so that the closed loop gain is controlled by the feedback ratio.
We are not here to do your homework for you, so I'm not going to give you the answer outright. Find the feedback path, then find it's gain. Assume the open loop gain of the amp is infinite, then find the closed loop gain from the feedback.
The feedback path clear and obvious in your schematic. The above is very easy to do, and the final gain can be seen from inspection.
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