That s the most effective solution.
The TDA2050 has higher current capability than the 2040 but this
latter has lower distorsion as well as lower max PS voltage ,
so the whole circuit has to be supplied accordingly with
a transformer that is about 2 X 12 V AC while not exceding 2 X 13V AC.
Using only TDA2050s for all channels allow for a 2 X 14V AC transformer.
Personnaly , i would opt for the first solution , 2 X 12V AC xformer ,
5 X TDA2040 + 2 X TDA 2050 bridged.
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