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If the tube displays a picture without an ion trap then it's gun wasn't designed to have an ion trap.
The datasheet may say that that type of tube should have an ion trap, but rebuilders often stuck straight (non-trap) guns in tubes that originally had traps and vice versa....Some rebuilders did these things as upgrades, most that did it because it's easy to loose the ID tags in a rebuild and forget exactly what you have.
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