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It should be all right, (and I'm sure you know this) but don't run it unattended. (and replace C61 before you do fire it up!)
I like to run things through a power bar so I have a kill switch on hand that's not near/on the set, just in case. Then, keep watching and listening for any funny business and kill it if anything else starts acting weird. Keep a good eye on the flyback and kill the power if it starts to drip wax!
I should add that gassy tubes usually have a blue-violet flickering glow to them, which is in the _space_ inside the tube... What it looks like you have (and you can confirm this, since cameras don't usually do fluorescent colours justice) is a pure, deep blue coming from the inner layer of glass itself- that's entirely the fluorescent emission of the glass from being bombarded with high-energy electrons.
There's a couple of videos on YouTube (heh) if you search "gassy tubes" that will help you distinguish between the two.
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