Whoopsee. The short, yes, should be a 220u cap with +ve
to the 0V rail. God knows how many times I looked at that
drawing too. The diodes are the same as the original but
now you mention it I think the zener at least is upside down
I'll cop for the cap but some proof-reader can take the fall for
the zener.

Well, I hope the text information isn't dodgy as well. Thought I
was being so helpful too. Some days it just doesn't pay to chew
through those leather straps and get out of bed does it ?

Jinx