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Technical explanation from Voultar:-
An LM1881 is going to generate a certain amount of line delay. And based on how many uS that line-delay is, the raster will start drawing the screen “too late” causing a horizontal shift in the picture. That’s on top of all of the nasty reflection problems and other things you have to take into account. If you have a device that requires a logic level sync signal, you should use what the console provides. An LM1881 should really only be used if you don’t have access to this.
Interesting, thanks! Obviously it’s stupid to use a sync stripper if there are no image artifacts or compatibility problems or native csync is available, but this gives me a reason to remove the stripper from my PAL GC cable once I get a better SCART switch.