Is the NE5532N Dual Opamp any good? - Page 7 - diyAudio
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Old 22nd December 2002, 10:07 PM   #61
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http://www.dself.demon.co.uk/webbop/2134.htm
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Old 23rd December 2002, 12:03 AM   #62
hifiZen is offline hifiZen  Canada
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machinow:

BJT opamps are subject to the same condition, due to their high input bias currents. It is always a good rule of thumb to ensure equal impedances at opamp inputs.

BTW - my current preamp uses a 100K pot input to OPA134 with a discrete SE class-A buffer inside it's feedback loop, and the sound is superb - among the best I've ever had in my system, and I've tried many different variations of opamp and discrete circuits using MOSFET, BJT etc... I'm about to embark on a project to build and test some Borbely preamp circuits, so we'll see how that goes. But, one must not totally discount the possibilities to make opamps sound good! In my case, I needed a quick'n dirty preamp for something different, and so built this circuit in an afternoon, being very surprised to hear it when I powered it up.
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Old 23rd December 2002, 06:28 AM   #63
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Quote:
Originally posted by jean-paul
http://www.dself.demon.co.uk/webbop/2134.htm
When I see those kind of measurements I'm always interested in the analazer's performance. What was the real distortion figures?

It's also critical to remove all sources of noise (computer monitors, lights etc.) in order to get correct results. <0.001% dist is not very much.
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Old 23rd December 2002, 06:34 AM   #64
Werner is offline Werner  Europe
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Erno has some figures for his usual 2SK170, ... discrete FETs in the FET papers on his website.Borbely Audio
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Old 24th December 2002, 11:52 AM   #65
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Default NE5532 vs OPA2134

hifiZen,
10-x for the reply. Do you mean in your pre- the OPA just sounds better than the NE5532/AN/ - I also like a lot the OPA134 /probably because I use it in my Power amp, which i believe is some kind of perfect , but according the theory, the BJT should have better performance there. OPA should have a THD of about 0.005...0.02 % in the worst case at 20kHz, but this may not be audible /again, according the theory!/ Anyway, why should I have these distortion, and at a higher price??
Because I haven't made the pre-amp yet I wonder which op-amp to use. My hearing experience is too limited due to the speakers I've got, so a difference between two quality products can not be caught with them. The parts I'm about to replace are the uPC4570's in an Yamaha integrated amp, the pre- section, where this part is used almost everywhere. /model DSP-A1000/ Generally the bad sound of this pre- /I can hear this difference with my speakers/ should come from the large number of signal electrolytics, and also some electronic switches, but they're correctly designed /the switches - loaded w. over 100kohms, supply +/-15V - LC7523 or some??/
Thank you again!
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