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The last thing you need is a counter. The signal generator for stereo won't work for TV so you will need separate units, in general. For stereo, a low distortion audio oscillator and an FM/AM signal generator will do. For TV you would need a sweep generator and/or an RF generator with video capability.
All this depends on whether you are working on vintage stuff or modern stuff. Modern stuff is all but unrepairable; you generally buy an entire circuit board rather than align anything.
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