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RE: Could you explain why

Could I explain why? Honestly, no, I couldn't. Not in terms of "the increased slew rate will cause the amp to perform in a more liner parameter at 80 CPS because blah blah blah".

I'm no expert, and don't pretend to be. I'm a music lover, kit builder, and parts upgrader. If the experience of many posters is that upgrading a 4558 op-amp to a 2604 results in better sound, with rarely a problem, I consider giving it a try.

In this case, the Texas Instruments web site says the TLE2072 is a direct replacement for the TL072 which was in my amp, and it's a better performer. Who am I to argue with TI? For $2.25 it was worth a shot.

I hope I don't sound rude in my reply. That's certainly not my intent. It seemed easy and cheap, and it was. It also may have been the complete mis-hit you describe. But I figured the "mis-hit" would be in the form of overkill, and no sonic change, rather than a somewhat degraded performance.

If there was no audible change from the increased slew rate and bandwidth of the new op-amp I never would have posted. It was the "better part = worse sound" that made me ask the question.



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