@gonk
Not yet, couldn't manage to get the 230V conversion exactly as I wanted, because the transformers aren't alike, the 230V doesn't distribute in twice 115V...
Wish they made them identical, like on the Arcam P7, which divides the 7th double secundary between transformer 1 and 2...
Now I'm going to split the PSU into a different cabinet for ease of handling...oh my poor back...

No, there was no pop from the 7700 when I switched it on with the ballast transformer; when operating on 115V the transformers are switched one after the other, in 4 stages.
What normally causes the pops (the smoothing electrolytic) is not very high in value, it doesn't have to be because every module has its own, including a rectifying bridge.
It's difficult to see what could cause the pop, because the amp switches on after several seconds, enough to leave the pops behind you...

Also, there is an elaborate error sensing circuit for each module AND the transformers.
The 7700 was also dead quiet.

In fact, the modules look better than those in the Arcam P7.