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You have a tube tester with a mercury vapor rectifier tube? That is strange. What is the type number?
Mercury vapor tubes are used because they have a low drop, so they more nearly approximate a silicon diode than a vacuum rectifier would. So in general, there are no precautions other than make sure you have sufficient voltage rating. To be on the safe side you can add a series resistor to drop about the same as the original tube.
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