Investigate the change in its dc bias conditions if the 741 op amp is powered by a pair of 69-V batteries instead of the usual 615-V power supplies. Hence, assuming the betas of the BJTs are...

Investigate the change in its dc bias conditions if the 741 op amp is powered by a pair of 69-V batteries instead of the usual 615-V power supplies. Hence, assuming the betas of the BJTs are unaffected, give rough estimates of the changes intervening in: (b) Rid, Gm1, and Ro1; (c) Ri2, Gm2, Ro2; (d) Ri3 and Ro. (e) How is the overall gain a affected? Justify your results.