![]() Consequently, these testers will catch nearly all problem tubes. These test tubes for emission, but the grid elements are connected to a source of voltage different than the plate, so the tube actually has to function to a certain extent before the meter indicates "good." Shorts and gas or leakage are also tested for. It was once estimated that worn-out cathodes were the cause of about 90% of all tube failures, so an emissions tester is good for "culling" the majority of bad tubes that are out there.īetter tube testers were known as dynamic or electrodynamic types. The better ones also test for leakage or gas in the tube. The tube is connected as a diode with all grids shorted to the plate, and the current it passes is measured on a milliameter. Low end tube testers measured cathode emission and shorts. Checking filaments can be done with any kind of meter that tests continuity-no special tester required. ![]()
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