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Once manufactured in Pentalabs, the tubes are subjected to rigorous quality control measures to further ensure reliability. Power valves and megatrons are first mounted in test devices and switched on for 24 hours. This burn-in helps stabilize the internal operating parameters of the tubes before the measurements start. Each device is then tested and classified for the technical characteristics specified by the Pentalabs engineers. Only after a component has successfully passed these demanding challenges is it labeled and stored to be sold.