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The problem with these sets is most definitely high voltage sag with increasing beam current...
The sag is the result of the voltage drop across the 1X2s...
I had one of these sets once, and after experiencing the blooming issue to the point of considering the set unwatchable, I removed the 1X2s and their associated filament windings and installed a solid state high voltage tripler (extracted from an old color television chassis) in their place.
The results were stunning.
High voltage regulation was vastly improved, and the focus issue was almost completely gone (only with the brightness cranked all the way up.)
ETA: I also installed a retrace supression circuit in that set so I could crank up the brightness a bit without having retrace lines. It worked flawlessly. BTW, don't remove the DC restorer. It will just make the set more unwatchable.
If you can stand to do this to your set, this is the cure.
Last edited by TV Engineer; 09-22-2010 at 09:39 AM.
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