Awesome, glad to see you tried it and it worked. I have done the hack and mine almost worked but didn't produce quite the correct output. I think I got a resister value wrong somewhere now, and I will go back and check it to see if I can get it to work now that I know someone else has followed the instructions and made it go. :-)
I have built the A1200 S-video Mod into My A1200 and one of in my A600, and about to do it again for another A1200. It works really nicely and I can actually use Workbench and see it all clearly on my 69cm Flat screen TV. I am considering buying some flat screen TV's to use instead of 1084S's because the result is comparable, and I get a really HUGE Amiga screen.
I mounted the SVHS socket under the PCMCIA port on the A600, and just in front of the floppy drive on the opposite side on the A1200. Sockets fit well and both machines output very nicely :-))
The same hack cannot be performed inside the A500, it dosen't have the RGB convertor chip inside it. But as pointed out above, you can hack the chip out of other older hardware and I looked around and found other off the shelf chips that performed the same function.
