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At some point you are going to have to try it again with the Anode connected and let it run.
If everything is grounded as it should be then it may just take a bit for the tube to settle in on first fire up.
I recall this happening occasionally when a new color CRT was installed.
It is possible the CRT could be damaged internally even though the guns are fine, the shadow mask could have been dislodged in shipping.
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