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So following some advice from Lotharek I’ve opened up the scart connectors of several of the above consoles (MD1, SMS1, SNES) and measured the voltage of the sync line (scart pin 20), some worrying results:
MD1 (fitted with 220uF cap and 470Ohm resistor – and my multimeter confirms as such) : 3.22v!!!
SMS1 (as above) : 1.13v
SNES (wired as sync-on-luma) : 2.02v
Since the lotharek states the Hydra follows the scart spec of a 1v max sync signal these are all out of spec.