A friend of mine has an Atari 2600 Jr. which produces a very "snowy" picture. He is using the correct phono plug from Radio Shack, replacing the crappy switchbox. But picture is still snowy. I read a prior archived post about adjusting the orange pot within the RF shielding -- this helped a little but not a lot. Any ideas? Is the RF shielding just not doing its job? HELP!