Another I/V Op-amp

[SoNic_real_one]

I found out that specs (correct readed) have a lot to do with the sound. For transistors, capacitors, diodes, OpAmps...
For example a 741 has worse specs than a 5532 and it sounds worse.

My jfet based OpAmp sounded and measured better than most of 70's OpAmps, but compared with the top of the line from 2010, it would suck. I did have access to lab-grade measuring equipment back then.

[b1o2r3i4s5]

Well I was doing comparisons between audio grade components and not general purpose ones. I do agree that an audio OP like the NE5532 would sound much better than the classic LM741

[SoNic_real_one]

Originally Posted by b1o2r3i4s5

The specs seem to have little to do with how they sound.

You made a "blanket" affirmation... If it was true, the specs of 741 and 5532 would have "little to do with how they sound".
Reality is different. Specs always matter. You just need to read them carefully and understand what they mean for a specific application.

[Extreme_Boky]

Originally Posted by b1o2r3i4s5

I too have played with many OP's but moved on to discretes learning in no circumstance will any OP sound better than discretes even if the specs are way off. but maybe i just haven't tried a good OP, so far the best i've tried is the AD8066 which i prefer over my AD843's.
The specs seem to have little to do with how they sound.

I'd advice you to give discretes another try.

AD8065 (and dual version AD8066) is one of my VFB favourites.

Boky

[SoNic_real_one]

Originally Posted by abraxalito

You're going to need a series RC on the DAC output to keep the noise gain high, preferably higher than +2 to mitigate the peaking.

Thanks for the ideea. I was trying to find a way to deal with that... But I got lazy, I did order an ADA4897-1, that is stable at Gain +1:
noise: 1 nV/√Hz, 2.8 pA/√Hz
distortion: −115 dBc @ 100 kHz, VOUT = 2 V p-p
−3 dB bandwidth (G = +1): 230 MHz
slew rate: 120 V/μs
settling time: 45 ns to 0.1%; 90ns to 0.01%
Now I have only to worry about the max 10V supply - that's exactly what I have now, kind of scarry close.

[Torchwood421]

Hi, I tried the AD843 in my experimental Opamp Preamp. Well... I much preferred the AD8065/AD8066. There was a noticiable overlay on the audio. Hard to describe, like a noise component. The AD8065's bettered the AD843 in everyway. AD8065's have a very natural sound so I agree with those who like that part. I'll be trying out some others too. I tried the AD8066's in my Hagerman Bugle phono and they are very nice in there too. Plenty low noise. Superb dynamics. Dave