Then maybe you should be looking for a newer picture tube for either of your sets.
You need to get the tube number from the paper label inside the cabinet, or off of the tube itself. You never know, somebody might have what you want laying around their basement/attic/garage/storage shed, or all of the above!
If you get a tube with a yolk and magnet already on it, leave it on, because you would have an awful time getting the convergence right after installing a tube with a different yolk and magnet assembly.
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Bruce
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