Mike Silva wrote:

Many thanks for running that simulation. Sometimes more is better, and
other times more is just more!

73,
Mike, KK6GM

I think a way of looking at the difference is that one is two half
wave doublers in series and one is two half wave doublers in
parallel. You would have a hard time using the parallel version if
you wanted an 800 volt output and intended to use electrolytic
capacitors, because each of the 3 would have 800 volts across them but
it may have some utility for low voltage outputs. There may be a
better way to connect the diodes, but I haven't got that far, yet.
--
John Popelish