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I have had success with wrapping wire around the core of the flyback to produce a boosted heater voltage and putting this to a DPDT switch mounted on the back of the set along with the regular heater voltage. This allows you to switch in the boosted voltage and back to regular...if the tube is starting to lose its reds, etc. but is not totally worn out you can switch in the higher voltage for a few minutes and rejuvenate it...the improvement often will last for a week or more before you have to rejuvenate it again.
With the switch, you are not over-stressing the tube from the boosted voltage continuously.
If the tube is just kind of lazy from non-use this can work too...this is only good for solid state sets as the extra filament winding will overload the tube type HO system.
On tube sets I have used boosted voltage say 8 or 9 volts from an external supply but it seems the tubes I tried this on were just too worn out to rejuvenate.
Yes I would also concur that on a set that hasn't been used for 30 or 40 years, just operating it for a while will often wake up that old CRT.
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