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Not to be flip, but I hope that most any "vintage TV guy" has a tube tester on hand. Now the yoke/flyback ring tester he may be able to skate on. Really, it's surpising at the work that can be accomplished without even the most rudimentary equipment such as an oscilloscope.
I know a guy who makes a good part of his living fixing TVs and he never uses a scope. It wouldn't surprise me if he didn't know how to interpret a waveform. Still, a tube tester is essential I say.
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