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Sorry to hear that you had that happen... It's happened to me more than once, and I know how it feels!
It sounds like an arc. If you didn't smell anything burnt, that is. First, check the HV fuse. I think in that set it's near the damper tube, but it's been a few years since I looked at a 5. An arc can also blast the rectifier, or possibly the shunt tube. Was the weather humid??? Those have a problem with the high voltage arcing through pin holes in the CRT shroud to the metal CRT mount hardware. Or, arcing in the cage. If the fuse is blown, replace it and turn out all the lights in the room. Watch carefully with full view, even have another person watching. Turn the set on, and try to see where/if it arcs. Pull the cap off the rectifier and see if the RF is there. If so, then suspect the rectifier or the 30 KV doorknob cap below the rectifier socket.
No promises, but that's where I'd start.
Charles
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