Building an ultimate low power class A amplifier – my way

Because of availability, at that moment, C8 & C11 were changed to 25V which is perfectly fine.
35V part is available now - 81-KRM55WR7YA476MH1L
KSC & KSA can be replaced with Toshiba TTC004B/TTA004B. Performance will be exactly the same.
 
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KTA1381/KTC3503 - Are these devices suitable for Q2-Q7?
I expect them to be the proper equivalent devices, but haven’t used them anywhere. Instead, I recommend to use TTA004B/TTC004B. They are perfect replacement in this case.

As in this design, Q2-Q7 are not in any usual VAS or differential input role, they don’t need to be matched. All measurements were made with unmatched devices.