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Looks like pins 4 and 10 will be the two potential places that I can break the connection and run two wires out to an eventual fused terminal. Then I can easily monitor this in the future by opening the two wires and placing the amp meter in series.
I saw a video where a guy showed two ways of checking the current on the tube. He was lucky enough to have some adapter that was made just for the purpose of cathode measurements. Also, he took measurements off of the much more easy to access plate cap, but he specifically used a stand alone milli-ammeter and stressed the dangers of doing it that way due to the extremely high pulses present there. Not sure why the old stand alone meter was any better to use than a normal analog meter, but that is what he used.
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