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You won't find any convergence adjustments on a Thomson, or later RCA. RCA for years used a single piece of magnetized plastic around the neck where the center convergence and purity rings would normally be. They either custom magnetized it for the CRT it went to, or had tight enough control over their CRTs to not need any adjustments. Later on, they started literally gluing the deflection yoke to the CRT neck so that once it's setup at the factory no yoke adjustments are possible. The advantage is that the yoke will never work its way out of position, but if the yoke fails you have to replace the CRT.
I have removed yokes from Thomson CRTs to allow me to reuse them in another set, but I had to destroy the yoke to get it off without breaking the CRT.
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