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I had this on a bw Zenith porthole; the area with the lines was compressed, maybe 1/2" or less wide. On that set (much different than this) there was an adjustment (horiz. drive?) that cured it. The typical problem, caused by HO tubes, is Barkhausen (SP?) interference & I've seen this cured by a new tube or I've heard holding a magnet near the tube will work but my luck there has been poor.
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Bryan
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