We find this conventional amplifier with complementary transistors in a 1987 documentation. The circuit must be powered by a source of at least 2 A and the output transistors must be provided with good heat sinks. The NTC stabilizes the rest current, set at P1. Output transistors and ACs are uncommon today, but types such as the BD135, BC136 can be tested instead with some polarization resistors being changed.
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