620 



BELL SYSTEM TECHNICAL JOURNAL 

 C" 



(y3,2+^2i)Vi| 



Go 



n\ 3xi / 



1 + 



-6 + r'^) 



1 + 



1 



M \ 3 xi / _ 



1 + 



5go 



'[-K-i:i')] 



C 



C2 



M \ 3 xi / 



Fig. 26 — Equivalent circuit of grounded grid triode at moderately high frequencies. 



In these tables the symbols have the following meanings: 

 go = static conductance of the diode formed by the cathode and equivalent 



grid-plane, 

 /i = low frequency amplification factor. 

 Xi = cathode-grid distance in cm. 

 X2 = grid-anode distance in cm. 



Ci = cold capacitance between cathode and equivalent grid plane 

 Ci = cold capacitance between anode and equivalent grid plane. 

 Gi = electron transit angle between cathode and equivalent grid plane. 



It is most simply calculated from 



coCi 



h = 2 



^0 



62 = electron transit angle between anode and equivalent grid plane. 



