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I've done this before and on rare occasions have been successful.
Be carefull if you try this. Take the socket off of the CRT to expose the pins. Remove the 2nd anode, turn on the set. When you have high voltage, move the HV lead around the pins so the juice jumps to the pins. Circle around all of the pins a few times, check for results, try again if need be.
If you know between what pins the short exists, you can try grounding one side then hit the other with the high voltage. If you have a heater to cathode short, and try the grounding trick, most likely you'll ruin the heater. What have you to lose?
Don't worry if you see sparks fly. Something is happening..for better or worse
If you have a gassy tube you will have your own "Northern Lights" display in the comfort of your own home.
Have your 2nd anode clean & dry and you won't have to worry about getting zapped (assuming you use common sense).
Good luck
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