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[Console Repair/Mod Center / Re: Update 7805 to OKI-78SR-5 for heat reduction]

That said, the negative feedback from thesteve and Keith makes me less enthusiastic about doing this to NEC consoles.

I wouldn't be concerned with their comments.  The Turbo Duo systems generate a fair amount of heat with the two stock 7805s.  Try leaving your finger on one of the heat sinks for a minute after the console has been on for a while!

Even Tim Worthington sells switching DC/DC converters on his site.  They are modern drop-in replacements for the old 7805s.  He has been incorporating switching DC/DC in a number of his products such as the Famicom-PA board and soon to be released 2600RGB.  Not to mention that a switching DC/DC converter will be a requirement for the HiDefNES.

I think Tim's ability to create a competent component video circuit  , as well as his other spectacular products (AV-DRIVER ) and adoption of switching DC/DC converters in his designs trumps a few bits of conjecture.  Also, if you're not using one of his AV-DRIVERs for RGB modding a Hu6260 based system, you're doing it wrong.