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They are trying to say that the "22" series CRT's will use the same testing protocols. Yes you can test it as a 21***22. Leave it on the tester all night at 6.3V and see if it's better in the morning. They usually always do better when they are awakened from a 30 year slumber. DO NOT REJUVENATE! All solid state tuner/amp means it's a '64 or '65. Probably a 16 clone. 60 cycle hum=new electrolytics. It wont do much until that's corrected. Any pics? Does the stereo/amp work?
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