So, how do you know mine is a multi-chip? I found a lot of information about SNES models, but couldn’t find much about SFC models.
Reverse LPF made a HUGE difference, by the way. Thanks for the suggestion! Sadly, I think I am noticing the noise bar even more… Currently I am using a third party AC adapter, and I have just purchased an official SFC AC adapter. It should be delivered in a couple days – I’ll give an update then.