As you have just heard, a theoretical approach to tube design cannot be relied upon to make better tubes from the standpoint of Barkhausen oscillations. A test is necessary to evaluate experimental tubes. While other methods have been tried, the test which we will describe has been found to be very simple and yet effective. This method requires only two pieces of equipment which most laboratories already have available. Although simple to set up and use, this test can be of value to any who are concerned in any way with Barkhausen oscillations.
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