Virtual ground
With power of symmetrical type, we do not need the virtual ground, and components that were working for this function have no purpose.
Output coupling capacitors?
A priori, we should not need coupling capacitors in the signal AF output of the preamplifier, since the resting voltage (no audio signal at the input) is close to 0V continuously. However, I leave to you to decide whether or not to implement them, knowing that the value of the voltage may be present output depends on the op amp used.
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