>dochubert: Sorry to hear you damaged your unit. I had a chance to look closely at your pictures and wanted to note what might have been an error in your hookup.
In my earlier post, I indicated you connect the secondary windings together (adding/subtracting turns, as you did). The primary connection wires appear to be white in color in your picture. You appear to have connected a leg of each toroid's primary to terminal P6. This looks a lot like an autotransformer hookup. As such, it doesn't preserve the standard isolation of a typical primary/secondary arrangement. I thought you wanted a 230 to 226/234 volt fully isolated transformer. It doesn't appear that you used this combo setup in this manner. I can't say that it was the fatal error, though.
I observed that same loud buzzing with my original control board, though it was related to pressing on the control board. Never lost my FETs, though. No problem with new board. Hope the 8010 board makes things easier re voltage adjustments.
Anyway, I think your toroids look nice. Do you have an online link to them? I might want them for a future project.
Also, does anyone have a picture showing the circuit board location of the 2SA1213 and 2SC2873 drivers mentioned by lighthunter? I don't see them on the control board, or are they down on the power board?