The circuit uses two transistor triplets in the output stage, and the quiescent current is set to 15mA through Tr7 as a constant current source. For small signals, Tr1 and Tr4 can be used as a tailless long tail combination. For positive signals, Tr1-Tr4 become active, appearing as a super-emitter follower, while Tr1 and Tr4-Tr6 serve a negative signal.
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