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That must be a rare set. I didn't think Sony made anything larger than 17" before the very late '70's. I have rejuvenated older Sony's with varying results. Some took, some didn't. Some of the ones that took lasted and others fell off in a short time. I always used a B&K model 480 to rejuvenate my CRT's. If you attempt to rejuvenate this tube, do it on a more modern tester like a B&K 467, 470, 480, or 490 or one of the later Sencore models. The older testers will often do more harm than good as far as rejuvenation goes.
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