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If the vertical sweep gets power from the boost, and the horizontal has the 6BK4 style regulator, then changes in line voltage likely will influence the vertical despite the presence of the VDR.
If you dislike the effects of line voltage fluctuation then I'd recommend you look for a saturable reactor line isolation transformer. These transformers regulate their own output voltage. Zenith used this type of power transformer in their CCII SS sets, and the results were impressive.
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