In theory you could.
But there are some potential problems.
The main one is that the transformers will be subjected to DC bias.
When both windings share the same core, the flux it sees averages to zero. it is not anymore the case with separate transformers.
Even if you use two sets of rectifiers to build a symetrical supply, any imbalance in the + and - currents will cause DC bias.
Another problem is that you will under-utilize the transformers: the copper is only used half of the time.
CT transformers take this fact into account and have a reduced copper area compared to the primary, but with separate transformers, you'll have to derate the output current by ~30%.
In summary, it is better to use a rectifier bridge and parallel the secondaries.
There will be one more diode drop, but in general that's negligible.
But there are some potential problems.
The main one is that the transformers will be subjected to DC bias.
When both windings share the same core, the flux it sees averages to zero. it is not anymore the case with separate transformers.
Even if you use two sets of rectifiers to build a symetrical supply, any imbalance in the + and - currents will cause DC bias.
Another problem is that you will under-utilize the transformers: the copper is only used half of the time.
CT transformers take this fact into account and have a reduced copper area compared to the primary, but with separate transformers, you'll have to derate the output current by ~30%.
In summary, it is better to use a rectifier bridge and parallel the secondaries.
There will be one more diode drop, but in general that's negligible.
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