Ah, now I had one of these on long-term loan, and gave it back. What to do is, figure out what the voltage regulators for the power supply are and that will give you a clue to the voltage. You can work it back from there, so for example if it wants a 15V supply rail you want a 12V transformer, because 12*sqrt(2) = 12*1.4142 = 16.9V, giving enough headroom for the regulator to work.
once again: thanks a lot Gordon,
i followed your suggestions, found a new trafo, and it works again
i must say that i prefer my coron ds8 soundwise, not that i'm dissapointed,
but i imagine the small decay range will get me bored after a while
and i guess resonance control would have been nice
and cv control over the pitch would have been nice to
but for what it is; nice analog percussion machine