Have you tried using the typical Western Latin (1) charset? OR just using lower-case?
Code:
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
trailing end slash is just for XHTML, you can remove for HTML 4.0
Personally, I would validate by the W3C standards rather than HTML Tidy, however neat a utility it may be! :o)
Useful reference for
international charsets
Paul