The Unilateral Dynamic Characteristics of Three-Electrode Vacuum Tubes: A Thesis (Classic Reprint) - Softcover

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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 Fig. 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 deflection 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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