r 



NODAL DETERMINANT OF CIRCUIT: 



WHERE Y,i = Yn-Y,2; Y22=Y2+Y,2+Y32+Y42; Y33=Y3 + Y32 



FEEDBACKS 



RETURN RATIO ON FIRST TUBE: T. = 



ON SECOND TUBE-. T2: 



Y33Y2' '^Y2' B-hP 



' + P3^P4 

 Y2 



i+E 



Pl2^P4 + P3-^P4 



Y33Y2' Y2' B+E 



WHERE P12 = T7^; P4 

 Yii 



Y2 



Y4 . p _ j!i. p _ ^ 



Y4+Y42'^"Y33' ^' Y33 



+ D 



TRANSMISSION 



Yt2Yi . ^ _ Y3 Y32 . ^ _ Y4Y42 

 Y„ '^"- Y33 ''^"Y4-.Y42 



E4 = I.a^l^^i-l2^ 



USING FOR I|2 AND I2 THE VALUES GIVEN ON FIGURE 8(C) 



E4=Ec 



-I 



i + B + D + E 



"*"^'^C' si" 1 + B + D+E 



Fig. 10 (a) — Input amplifier formulas. 

 895 



