O-oooh!
Klimon, I must rain on the parade. A high-voltage zener is attractive, but has a severely positive temperature co-efficient. I once bit the dust with 100V zeners. They drifted up to 110V with temperature rise - not boiling either.
"Neutral" zeners are around 5,6V, but I cannot fancy you wiring some 40+ of them in series (though I know someone who did)! This may not be serious for you, but you might consider at least a few in series - say 5 x 50V. And yes, noise will be of concern; a large capacitor will help.
If you are aiming for a signal-neutral supply (i.e. not UL), it is better by far to make a regulator using a few 5V - 6V zeners. Since you do not mind zeners, such a regulator can conveniently be transistorised - it is not part of the signal path (for the puritans).