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> cheap SCART to HDMI convertor

From my understanding this is the "bottleneck" in quality for older systems (at least in gaming consoles), converting Analogue to Digital. Which is why "RetroTink" sells different converters from ~$100 up to $750 (RetroTINK-4K Pro). I've seen a few videos comparing cheap generic USB converters with more expensive upscalers and there is a noticeable difference in image quality