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It might be that some schematic's junction points did disappear.The 8 ohm speaker is driven through a series 180k resistor!
Why does the circuit have TWO output stages? The one with the 2N3904, 2N3906 and 2 diodes and the other one with more transistors and 3 diodes.It might be that some schematic's junction points did disappear.
Looks like a electronics newbie tried to invent a square wheel.Why does the circuit have TWO output stages?
There are hundreds of class-AB audio amplifier circuits shown in Google. Most are excellent but some are very poor like the one you showed.And how would you define reasonable designs sir?