Excerpt from The Unilateral Dynamic Characteristics of Three-Electrode Vacuum Tubes: A Thesis
The effective resistance of these circuits are as follows: fundamental, ohms; first harmonic, ohms; second harmonic, Ohms; third harmonic, Ohms.
Arrangements (not Shown in F... ig. 1) were also made for measuring higher harmonics than these, by changing the inductance Lu, and by retuning C11. Each thermo-couple could be connected successively to a Leeds and Northrup galvanometer, and the de¿ection of the latter indicated the root - mean square value of the alternating current passing through the heater. Previous to placing the thermo-couples in the Circuits, they were calibrated using alternating current (60 cycles). It will be seen that the harmonic analyzer is essentially a voltage amplifier, picking out each frequency in the producer and magnifying its voltage. For this reason a tube with a large voltage amplification constant was Chosen, in fact the value of u as given by equation (4) was 26.
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