Quote:
Originally Posted by Marco-nix
ElectronicM, i was talking about some TV sets not for spécific television..I guess that Doug has a video about a Zenith with cataract..I'm not sure.
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There is a linguistic vernacular misunderstanding in your interpretation of my comment....There are two different types of PVA glue that have two different failure modes, and require different removal processes. Tubes made by Zenith, and Sylvania typically develop a green tinted halo, the glue even now remains elastic and sticky, and the only way to remove the safety glass is to cut through the glue with a wire....On this forum we call this cataract type a 'Zenith type' regardless of who actually made the tube that has that type of cataract.
In contrast an 'RCA' type cataract (the biggest maker of tubes that have the issue was RCA) creates a fuzzy white halo that sometimes develops black mold growing in it, the glue is hard, inflexible, and no longer is sticky, and there are three methods that can be used to remove an RCA cataract: Soaking it for several months, heating it in the sun and using wedges around the edge to slowly pry the glass off, or use a heat gun to propagate the de-lamination inwards.
If you use a RCA cataract removal method on a tube with a Zenith style cataract or the other way around the result will normally be either no effect, or damage to the CRT/safety glass being worked on.
Doug has some videos on RCA type cataract removal, but I've not seen any videos on 'Zenith type' cataract removal from him, or anyone else before....The only documentation of the Zenith process I've seen was pictures of it from username CTC-17 on his 'boxcarcabin' web site.