holy hell Zack NEVER power a Famicom or Super Famicom with an NES-001 Power Supply! That's the WORST thing you could do!
Unless your Super Famicom has been modded with a bridge rectifier which is NOT stock.
As I commented in your video, the only possible explanation to why this works is your SuFami was refurbished and someone bizarrely added a bridge rectifier in that Super Famicom to allow exactly what you're doing here - feeding it the wrong voltage type.
I have seen many people trying to use an NES AC 9V power supply with the results always being catastrophic. Stock Super NES/Super Famicom motherboards do not have a bridge rectifiers and cannot be powered with AC. This is why Nintendo of America changed the barrel shape of the SNES - to prevent idiot kids from plugging in an NES Power Supper into their SNES and BOOM you've got a dead SNES. The Super Famicom doesn't have this safeguard because the preexisting Famicom power supply is also 9v DC center pin negative.
Honestly, you really ought to collect your NES power supplies (if you're like most of us, you've got more than one) and put them in a bag and store them somewhere far, far away from your consoles. The NES can be powered by pretty much anything - AC, DC, negative pin, positive pin, 9v, 12v, a variable power supply, linear power supply, whatever. On the other hand, the NES Power Supply RUINS other consoles. There is no reason for anyone to use it unless their ONLY system with a barrel plug is an NES. Otherwise it's a disaster waiting to happen.
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