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The Magnets you removed were for Focusing, since teh 21YP4 is Electrostatically focused it should be OK (actually required) to remove them.
YOu can focus the tube either by leaving the focus pin disconnected or by applying some B+ to it, whichever gives the best results.
The Ion Trap is absolutely critical, misadjusted will give a dark screen at least and damage the tube at worst. It's adjusted for best brightness and focus, it is also directional front to rear and it may be the wrong trap if it's off the 21ZP4.
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