Try replacing the cable 1st, if that fails it is probably a bad CRT.
Samsung CRTs are notorious for going bad even before their warranty period has expired
The "shadowing" you talk about is due to cables in back of your computer, touching or too close together. I had this happen to mine. I moved the cables apart, and no more shadows !! Sounds too easy, but it works.
PICTURETUBE WEAK....
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