1128 THE BELL SYSTEM TECHNICAL JOURNAL, OCTOBER 1951 



For zero signal this becomes 



/b = Go (y + £.1)"* (13) 



For a pure resistance load which is small compared to the plate resistance, 

 the fundamental component, neglecting contributions from third and higher 

 order terms, is 



ip = Gm Eg cos pt (14) 



Neglecting the contributions of fourth and higher order terms, the second 

 harmonic component is 



3 E^ 

 ^2P == Ib72 77^ 7-2 cos 2pt (15) 



16/£.. 



V 



M / 



This is found by expanding (12) into the binomial series. From Assumption 

 III and equation (5), 



The amplitude of the second harmonic component, from (15) is 



h. = l ,J"^' . . (17) 



Substituting for 



(y + '^-.)' 



From (14), 



Substituting from (19) in (18), 



This can be written 



(18) 



(19) 



(20) 



(11) 



