13.23 Refer to Fig. 13.27 and assume that the bases of Q6 and Q7 are at approximately constant voltages (signal ground). Find Ro6, Ro7, and hence Ro. Use VA = 125 V for npn and 50 V for pnp transistors. Assume the bias current IC6,7 = 19 µA and R4 = 5 kΩ.
Ro6 = 2.63 MΩ; Ro7 = 31.6 MΩ; Ro = 2.43 MΩ
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