@ Ritz
On second thought, because of the transformers probably having multiple windings, I will just let the toroids sit where they are and series the primaries, getting 230VAC effectively!
It is possible to add sec windings to a toroid, as they are the outside layer, but the first solution is easier...
There may be some soft start deriving AC from the primaries which is set to 115VAC, but I'm sure I can work that out.
(Maybe some Honcho Gunslinger can provide me with the primary circuit, so I can start thinking...?)
The toroids may get a littlebit warmer, because of 50Hz operation, but I think this won't be a big problem since my FLH+FLL-C-FRH-FRL-SR-SL application has only 2 power hungry channels: the two bass biamped parts of the Front channels.
Barend