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Years ago to check to see where the overload was, we would remove the cap from the 1X2 to the flyback and let it hang in mid air. Using a well insulated screwdriver NOT connected to ground, bringing it near the cap should make a fairly long spark to jump to the screwdriver. If the spark goes way down when the cap is reconnected, it means the overload could be from the 1X2 on to the CRT. If I remember right, this set has a high voltage doubler so arc over of the flyback may not be as possible as with some half wave setups. Don't leave it on long, just enough to test the spark. Check for pinholes in the 1X2 filament windings. This usually makes a burning smell unless they are carbonized badly and are really loading the high voltage down. From your description, as horizontal output starts working the 1X2 filament starts warming up and a leak path to ground will get worse as the tube warms up.
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