Is it normal taht the tube was barely lit with a pale blue light more visible at the end of the tube than center?

This is normal for a very high frequency. The tube is capable of transmitting up to about 4 MHz. Once you see any illumination at all, it's working. You may have to turn off the room light to see it clearly or draw curtains or blinds.

For more details, please check the link from:
https://www.facebook.com/groups/spooky2/permalink/691797850982121/

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