ADMITTANCES OT PA RA [.LEI. I' LAX E ELECTRON TUBES 



633 



wcUian velocity distribution prevails, in the experimental case it is prob- 

 able that, for values of the abscissa greater than 6 or 7, the actual transit 

 time is considerably greater than in the theoretical case. In fact, at a value 

 of 11.4 the anode voltage was zero, the anode current being maintained by 

 the thermal energy of the electrons. 



Z 3 



o 

 o 



1 2 3 4 5 6^7 8 9 10 11 12 



' '3 



AJo''^ 



Fig. 13— Comparison of thcorclical and experimental values of diode conductance 

 and susceptance. 



Other diodes were tested, but they exhibited results substantially equiva- 

 lent to those already disclosed. In a few cases anomalous results were ob- 

 tained. With some diodes the capacitance with no electron flow did not 

 approach the low-frequency value. These were rejected on the assumption 

 that there was some mechanical imperfection in the tube which changed the 

 calibration of the measuring equipment. 



