How does injecting a signal then capacitively picking it up with a scope constitute a form of emissions test? It seems more like a way of confirming none of the internal connections to the gun elements are not open. Okay so the red screen is not open, and the gun bias is correct, so by process of elimination the gun must be weak...In his shoes I'd still get a CRT tester and make sure that all the data that fed into that process of elimination is indeed leading to the right conclusion.
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