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I used to replace a lot of those selenium rectifier focus sticks. They were a very common problem of poor focus. Mainly I bought those made by Workman. Also there is a boost selenium rectifier that goes bad as well under the chassis that provides the boost voltage for the screen controls. When that goes bad, boost voltage drops, along with the brightness which is tied to one side of the color screen controls. Workman also made those as well. Both of those were very common to go bad.
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