The improvement depends on how well made the power supply is on the console, as well as the transformer it comes with. I would have to look into the power supplies of the N64 and psx. But they probably work off of the same voltages, you have to make sure the transformer or linear power supply has enough amperage for the console.
Beware the snes has its polarity reversed compared to most electronic devices with a barrel plug power connection. Meaning the inside wire is neutral, not hot or live like most electronics. They make adapters for this though.
That 9volt iFi transformer has all the main barrel plug sizes to fit most electronics. It also comes with a polarity reversal adapter as well ( if I remember correctly ). If you have an nes with some cheap transformer, you could try out the genesis transformer on the nes and see if it makes an improvement. I have used 12 volt DC transformers on my nes and genesis of different types, usually the heavier ones produce less video noise. Just always remember, the original nes transformer puts out AC voltage, so never use it on anything else or you will destroy the device. But it is safe to use transformers with DC output on the nes bc it works with DC on the inside of nes.
Dont use any other transformers on the snes until you understand the polarity reversal that I mentioned earlier. You can get adapters that would make normal barrel plugs polarity reversed, if you had one then you could put it on the snes. You can get these at radioshack.
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