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The lowest 6-9 dashes are macrovision (I coulden't remember the name earlier and called it copy protection) and they occur on the fainter slanted retrace lines. The macrovision has to be filtered out of your signal source with an external device of your choice (there are many avaliable). The retrace lines can be made unnoticable by either adjusting the brightness and or contrast to make them disapear, or by adding a blanking circuit (some tube sets have blanking circuits built in so it may be that the circuit is not working right if it is present).
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