This circuit consists of a traditional amplifier version with complementary output using BD series transistors. The circuit provides excellent sound quality. Power transistors must be mounted on heat sinks. For a stereo version, the source must have twice the indicated current, as it must supply two circuits as shown. T3 has the collector off, since the emitter base junction is used as a sensor. This transistor must be attached to the heatsink of one of the output transistors.
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