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#1
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High end OP's - LM6171 vs. OPA604 vs. OPA627 vs. ...
Hi,
an old question - what is your experience for this OP's in Audio High End amplifiers? Which have the most "true, unsophisticated sound"? :-) LM6171, OPA134, OPA627, OPA227, OPA604, AD812, AD823, AD8610 or other new OP's - but DIP case preferred. I listen all this OP's on my side http://www.stockhammer.at/hifi/audioproject1.php -- Mit freundlichen Gruessen - Yours sincerely Friedrich Stockhammer http://www.stockhammer.at/ |
#2
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Friedrich Stockhammer wrote:
Hi, an old question - what is your experience for this OP's in Audio High End amplifiers? Which have the most "true, unsophisticated sound"? :-) LM6171, OPA134, OPA627, OPA227, OPA604, AD812, AD823, AD8610 or other new OP's - but DIP case preferred. I listen all this OP's on my side http://www.stockhammer.at/hifi/audioproject1.php The 5532 is a superb audio opamp, so I am not sure why you would want to replace it. Having said that, if you have fairly high source resistances in your application, you can get a lower overall output noise by using opamps with lower input current noise. The OPA134/2134/4134 from TI/Burr-Brown are excellent. But I doubt very much if you can hear the difference between those and the 5532. All these have very low distortion even at 20KHz. Check out the specs of the OPA2134 he http://focus.ti.com/lit/ds/symlink/opa2134.pdf Since the differences are so subtle, if any, you are totally at the mercy of sighted bias when you compare the sound. Make sure you have some test equipment, especially an oscilloscope, to check that you have not made any mistakes, and that there are no oscillations. |
#3
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Am 26 Feb 2005 19:24:44 GMT schrieb Chung:
The 5532 is a superb audio opamp, so I am not sure why you would want to replace it. Having said that, if you have fairly high source resistances in your application, you can get a lower overall output noise by using opamps with lower input current noise. The OPA134/2134/4134 from TI/Burr-Brown are excellent. But I doubt very much if you can hear the difference between those and the 5532. All these have very low distortion even at 20KHz. These question are not for replacement - I want this but I have not done till today - in my old CD 650, but these OP's are for an new pre- and headphone amp. -- Mit freundlichen Gruessen - Yours sincerely Friedrich Stockhammer http://www.stockhammer.at/ |
#4
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Friedrich Stockhammer wrote:
Am 26 Feb 2005 19:24:44 GMT schrieb Chung: The 5532 is a superb audio opamp, so I am not sure why you would want to replace it. Having said that, if you have fairly high source resistances in your application, you can get a lower overall output noise by using opamps with lower input current noise. The OPA134/2134/4134 from TI/Burr-Brown are excellent. But I doubt very much if you can hear the difference between those and the 5532. All these have very low distortion even at 20KHz. These question are not for replacement - I want this but I have not done till today - in my old CD 650, but these OP's are for an new pre- and headphone amp. For preamps, my recommendations still hold. For headphone amps, you need different parts and not simply opamps. Designing a low power headphone amp for portable use, and designing for a home AC-powered application have different trade-offs. You should check out the National LM4908. |
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