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The probable reason to measure the cathode current versus current at other elements is that adding a meter in the cathode circuit would be least likely to affect the circuit operation. With all of the other work done on one of these sets, temporarily unsoldering the cathode connection and using a couple of clip leads should not be too tricky, at least it was not for me.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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