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I wouldn't think any pre-war CRT would have ever been bright enough to watch in a fully lit room. This was the norm even for many American non-aluminized CRTs through the 1940s into the early 50s. If it has a useable picture I wouldn't risk ruining it with a rejuvination; though if you're going to try the CR-70 is one of the most capable machines for the job.
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