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those wavy lines are the same ones I was getting on my Dumont ra-109 , what made them go away was when I adjusted the width and drive and all that , they may or may not still be slightly there , I know when they were there tuning would make them lighter or bolder , I hadn't noticed them lately so when I run it again I will look closely and if they are there even faintly I will report it.
mike
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