Thanks for the tip Gigafrog!
The redundant circuitry appears to be more complex than I originally expected, and I haven't found a simpler way to do n+1, yet.
I agree, the multiple PSU might add to the overall ripple in the output lines. On the other hand, if I was able to reverse the polarity on one of the PSUs (assuming 2 PSUs), I would be able to eliminate the ripple entirely, at least the one coming from the 60 Hz cycle, but since I was headed for 3 PSUs, I was back to square one.
I'll ponder this one a little longer.
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