. The Bell System technical journal . Fig. 21—Western Electric 1B22 sparic gap tube. spacing of 150 mils was selected, the gas pressure being 20inches of 75% hydrogen and 25% argon. This gave a life of about 500hours for the microsecond pulse, and a much shorter life for the pulse. However, since the latter pulse duration is used onlya small part of the time, the service life proved to be adequate. In orderto obtain the maximum life from each tube, it was necessary that the anodeand the cathode depart no more than a few mils from concentricity. Other-wise th
. The Bell System technical journal . Fig. 21—Western Electric 1B22 sparic gap tube. spacing of 150 mils was selected, the gas pressure being 20inches of 75% hydrogen and 25% argon. This gave a life of about 500hours for the microsecond pulse, and a much shorter life for the pulse. However, since the latter pulse duration is used onlya small part of the time, the service life proved to be adequate. In orderto obtain the maximum life from each tube, it was necessary that the anodeand the cathode depart no more than a few mils from concentricity. Other-wise the sparking would not be uniformly distributed radially, leading to a 596 BELL SYSTEM TECHNICAL JOURNAL non-uniform anode build-up and a shortened life. Furthermore, in orderto prevent failure of the tube, due to sputtered material destroying theinsulation of the interior glass walls, the inside diameter of the cathode wasenlarged near the open end, thus confining the sparking to the deeper por-tion of the cathode cylinder. As discu
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