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seems like you could use the autoformer out of a later model color brighener. It would not be plug and play but would prob work ok (you would need to wire it in with the filament leads). It would prob run hot as I assume the older CRT's had a higher filament current than the later ones, but that may work anyway as it would mean the voltage drop would cause the boost to be less, closer to what you are looking for anyway. If you dont leave it on for long periods I would think the overloaded autoformer would not be a danger. I have a GE roundie that needs such a boost that I may try this out on.
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