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Message: <blockquote data-quote="singhvi" data-source="post: 1159544" data-attributes="member: 1155"><p>The circuit is not all that bad - direct coupled, differential input, triplet output, though missing some finer elements (current mirror etc). The opamp implementation for gain (phono input and insertion loss for the tone circuit) will have the biggest influence on audio quality based on the opamp chosen (4558), imho. I suggest you swop them for something else. NE5532, perhaps - these are cheap enough (~R25 ea), to try. Install opamp holders to try others. Local availability of opamp alternatives and package (you are looking for 8-pin DIP dual opamp) will limit your choice. Your criticism of a lack of detail should be addressed to some degree with better opamps. A re-cap with decent quality caps can follow (I’m guessing the amp’s ~ 25/30 years old).</p></blockquote><p></p>