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Transistor vs (NE5532) dual op amp phono sound!

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G'day all, one of the nicest things about my Rothwell Audio 'Simplex' is that it doesn't really sound like a typical op amp based phono stage, which is just as well as it is a circuit entirely based on discrete transistor circuitry.  However and there is always a however, the Simplex has an endearingly 'cool' sound about it and listening closely to it I decided to carry out an experiment. 

 

I replaced the OPA2134 in my latest Bruce Heran design phono stage build with an NE5532 and lo and behold that phono stage now possesses a similar 'cool' sound in large part.  In all honesty I have noticed this 'cool' NE5532 sound before in other DIY  circuitry I've built in the past, but never made this association before. 

 

This is all getting more than a little confusing though given the complex and highly contentious subject of supposed op amp 'sound'.  All things being equal the humble ole' NE5532 is still a superb dual op amp for high quality audio applications.  Perhaps, as they say, 'the more things change, the more they stay the same'.  Maybe!  Regards, Felix. 


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