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I'd get the chassis working right, and then maybe consider running the heaters high for a few minutes if it was too dim, but you can likely get good use out of it.
I've gotten good results from tubes that test squarely in the bad range (at about 1/4 full scale deflection) with a good chassis adjusted to drive the tube as best they could....It may not be 'watch it with direct sun shining on the screen' bright, but in subdued lighting it should be capable of producing a good picture (assuming all the drive circuitry, and magnetics in the set are working right).
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