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I would only start worrying about this after you get it and can test the tube, and even then just testing it is not going to prove it one way or the other that you will or won't have a serviceable picture, as long as you don't have a drastic problem like shorts in the guns, something major like that. Besides the rejuvenation, a filament 'booster' device that plugs in between the picture tube and it's connector is another option. (easy to find on ebay etc.) They only worked for a while before the tube finally gave out back in the old days, but I would think with such low useage these old sets get now being in collections it is probably an excellent option if it does some good.
Sometimes even shorts in the guns can be 'zapped' out with a jolt of high voltage if it's a piece of internal dust or debris that is causing the short.
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