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Show : i Audion Oscillation 1 Very little has been said about the j oscillating point of the audion. Al- j though two vacuum tubes may be of ' the same type, they will not always ' operate efficiently under the same con- j ditions. Vacuum tubes vary in their j characteristics; there are no two bulbs j alike. The main trouble with non- j oscillating V. T. circuits lies In the i fact there is not much attention paid i to the B battery potential. When try- lng out a new bulb, test it. using a i variable plate voltage, as some tubes are very critical, necessitating careful care-ful adjustment. |