94 



BELL SYSTEM TECHNICAL JOURNAL 



Ro = 



12ro 



r]—sinr]\, /I— cost;., . ^. 



(61) 



Xn=-—T^l I (r-sinf)+ ) (1-cosf 



r I 



+ 



K'-T(l-cosf)+2sinf 



+K<-M- (62) 



RESISTANCE 

 -0.6-0.4-0.2 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 



Fig. 14 — Ro — A'n diagram for positive grid, slightly negative plate triode with 



cathode space charge. 



Curve A, T] = i; 

 Curve B,v = 1/2? 

 Curve r, 17 = 1 /3f 



The corresponding R — X diagram is given in Fig. 15. 



Again, the equations for a negative plate and no cathode space 

 charge are, 



R, = 



12ro 



77 - sin r; \ 



1 — cos rj 



(r- coth r - r) 



, (63) 



Xo 



12r„ 



1 - cos r? \ .,, ^ ^ ,_-_sm, ^ ^^, ^^^^ ^ _ ^^ 



