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If the drive is turned up high to compensate for a weak tube, you can get an obvious bright "tearing" to the right of white objects, ususally in one color (often red.) You can get rid of this by turning down the contrast or "picture" control.
If you have a smear that's there at all contrast settings, it's something else.
By the way, a weak picture tube won't usually be especially dark because the screens and drives will be turned up to get the brightness back. Then two things can happen:
the gun(s) runs out of current in the highlights and the picture gets a "milky" look and/or changes color in the brightest highlights; and/or the excess video drive saturates an output transistor(s) giving that bright tearing to the right.
So, the word "smear" is not sufficient to diagnose what you are seeing. You also need to diagnose by turning the color all the way down to see if the smear is in luma rather than chroma.
Does this set have synthesized tuning, or is there a fine tuning control that could affect it?
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