IMPEDANCE PROPERTIES OF ELECTRON STREAMS 



477 



zero for smaller values of ^. Consider for instance the case for which 

 (f = 0.04. The capacitance is here negative even in regions of small 

 space charge and it is seen that over a wide range of the parameter ^ 

 the capacitance is nearly constant. Both capacitance and conductance 



-5.0, 



6 8 10 12 14 



INTEGRATION CONSTANT ^i" 



20 



Fig. 7 — Relative input conductance of an idealized space charge grid tube for different 



space charge conditions. 



2.5 5.0 



7 5 10.0 125 1570 17.5 20.0 22.0 25.0 



INTEGRATION CONSTANT \/|" 



Fig. 8 — Relative input conductance of an idealized space charge grid tube for different 



space charge conditions. 



pass through zero for the same value of ^ and one sees that in case of 

 <P = 0.04 no critical adjustment seems necessary. The conclusion is 

 thus arrived at that the idealized space charge grid tube may be 

 made to operate without input capacitance or loading up to moderately 



