Hi, i'm looking for the same parts. I contacted Kitamura Kiden and Pionner for info. I think then it will be possible to build custom transformers.
As I can see on the
schematics, it seems to be :
VTT1075: 80VA (on the transformer, confirmed by size) : 6-0-6V, 12-0-12V,
0-9V or
0-10V and
5-0-5V but not sure of the last two underlined parameters. I used the schematics but it's quite difficult to know.
VTT1076 :20VA (idem) seems to be 0-9V and 0-9V because the power-on voltage (5V) is adding to this voltage once regulated.
I'll tell you if I have some news.
Kind regards