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The regulation on these sets is not all that great. The brightness going down on bright scenes is mostly due to the lack of full DC restoration. 24kv is just fine, try reducing the contrast slightly. Its not uncommon to get a little shrinkage on a bright scene. Shrinkage accompanied by loosing focus is often an indicator of a weak horizontal output tube and on occasion the damper.
These sets are not like newer CRT sets with well regulated HV and full DC restoration. You have to watch them in slightly darker rooms and not have light source hitting the face of the CRT.
If you have vertical problems, they wouldn't likely be caused by and HV problem. The two stages are not associated with each other - however the horizontal stage is directly associated with making high voltage.
post a snapshot of the horizontal output tube on the schematic, and I'll point it out. Its also helpful to have a receiving tube manual if you're having trouble reading the schematics.
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Jordan
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