This circuit is from an English magazine from 1980, but it can be easily assembled with more modern transistors. We can use the pair BD135 and BD136 in the output and the BC558 for Q1 and Q3. The circuit provides good power and needs a 25 V source with at least 500 mA. Output transistors must be mounted on heat radiators. Two channels must be mounted for a stereo version.

 


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