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I used to have the 22" metal version of that GB1 chassis set and it had a CRT that was so dead that you could only see a little bit of an image in a totally dark room. I hit it with the rejuvenator and sold it for $40 (this was about 24 years ago). Either it held up or whoever bought it didn't throw a fit when it stopped working. Looking at your CRT, I see that it has a 313 EIA number; so, that means that Sylvania actually made that tube.
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