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Monochrome TVs are often fitted with geometry correction magnets around the scan yoke. If these aren't fitted or are missing then the result is often pincushion.
The photo is of a 12" professional monochrome monitor and shows several correction magnets. This is more complex than an ordinary TV due to the need for higher performance. A monochrome TV will often have a pair of cylindrical magnets mounted on the yoke.
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