To a 16-0hm load, this amplifier provides a power of 10 W. We found this circuit in a Motorola amplifier manual from 1972. Transistors are uncommon, but we can use the TIP31 / 32 pair at the output, a BD136 for Q3 and for Q1 and Q2 the BC547. The input resistance is 250k and the maximum current of the source is 390 mA.
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