This circuit is from a publication from 1980 and can be used as an amplifier to supply loads up to 500 mA if the output transistors are BD135 and BD136. For the pair TIP31 and TIP32 the current can reach 2A. The symmetrical power supply, in fact, can have 6 to 15 V. The growth rate of the circuit is increased by the feedback network R2 and the capacitor of 15-pF
