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Sadly, that sounds like the tube is gassy. Those have a circuit that prevents the video from popping on, until the cathode current is in a certain range. When the tube is weak, it will never pop on once the current is out of that range. A quick test is to VERY SLIGHTLY back down the G2 pot (on the FBT in that set? not sure), and if the picture pops on, then it pretty much confirms you have a bad CRT.
I have one here in SoCal if you need, but obviously it's not shippable.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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