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Class D Switching Power Amplifiers and Power D/A conversion

TPA3250 somebody is listening?
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Old 26th July 2019, 07:56 AM   #961
scxrye is offline scxrye
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Join Date: Jul 2019
Hi!


I've replaced the ne5532 op amps in the FX502SPRO with two opa2604, But after reading trough the topic, I'm not so sure if its as easy as just pop in, and out.



Is it safe to replace the two ne5532 with Opa2604?
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Old 26th July 2019, 10:33 AM   #962
Turbowatch2 is offline Turbowatch2  Germany
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Location: Northern germany
If you put them in with the right orientation, which is no easy task, as they fit right and wrong, the worst thing that can happen, you will not hear any difference. Eelectrically they work in the same spot / conditions.

Chances are good you will hear something, because most China ampīs have fake NE5532 for a obvious reason: It is an expensive, high quality OP-amp.

So you might hear the difference of some NE5532 labeled 2 Cent OP amp to your expensive OP amp. Well, only if it is no fake opa2604, like the ones from eBay.
In that case (eBay) you might hear no difference...

Confusing, isnīt it?
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Old 26th July 2019, 10:51 AM   #963
scxrye is offline scxrye
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Join Date: Jul 2019
I've already swapped them, I'm more worried about the instability mentioned here

than orientation. The Opa2604 is from a local store. I've been promised it is real. And there is an audible difference.



The ne5532 came with the unit is quite harsh, overly bright. The Opa2604 takes that edge away, sounds warmer and more musical.
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Old 26th July 2019, 10:57 AM   #964
Turbowatch2 is offline Turbowatch2  Germany
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Join Date: Aug 2013
Location: Northern germany
Just like I experienced, changing fake NE5532 for a real one...
Great to hear you improved!
Instability should be a real design fault.
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