I modded my SNES to output RGB, and had to boost the signal levels by soldering a 100uf capacitor in each line. Trouble is, I get lots of RF interference in the picture. Would some aluminum shielding over the caps and wiring help?
I have no idea.
but, a dead NES has lots of RF shielding, you could cut into small enough peices, to try a "real" RF shield.
I'd be curious to find out if it worked. :/
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