EQUIVALENT CIRCUITS OF NETWORKS 619 



that the efforts of trying to interpret the "passive" parts of the networks 

 in the form of lumped passive circuit elements had, in general, met with not 

 too much success. In this section attention will be given to the range of 

 moderately low frequencies where usual circuit interpretation is possible. 

 The operating conditions are assumed to be the usual ones with complete 



Go 



CO 



1 (a>Ci)2 ^ ^ "^ M 



5 ' 



• [-K'nl')]' 



4 





g" = - 



1 + 



((0Cl)2 1 





W \ 3 :»:i / 



^\ 3 a;i / 



1 + 



"1 + ^(1 + ^%) 



H\ ?>Xi J 



Fig. 25 — Equivalent circuit of grounded cathode triode at moderately high frequencies. 



space charge in the cathode-grid region, and negligible space charge in the 

 grid-plate region. Also it will be assumed that the grid is at negative d-c 

 potential with respect to the cathode. 



The first step is to expand the /3 coefficients in series with transit angles 

 retained only to first or possibly to second orders. As the detailed computa- 

 tions are lengthy only the final result will be given. These are presented in 

 Tables IV, V and VI. 



