Interesting method. I'd not considered using S-Video to connect from a PC to a 15Hz Amiga/retro monitor, mostly because the monitors are RGB, so the cleanest method is logically to try and get an RGB signal to the monitor. But recently using S-Video for a better picture has been utilised more and more the the retro world.

Could you do a quick schematic for me on how to make such a cable to connect S-Video to 1084S monitor? Do any resisters need to be placed within the cable on any of the lines? When I recently made up a couple of Atari ST to SCART cables I had to put some resisters in to reduce the brightness being output for example.