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Best sounding op-amp

I have a stock Music-Hall CD-25 that I'm planning on doing some 'easy' tweaks on. One of tweaks I had in mind was changing the op-amps. It currently has a pair of Burr-Brown OPA2134PA's, but I was curious if anyone had any experience/suggestions on other op-amps that might produce a little 'warmer' sound. Possibly considering one of the Analog Devices op-amps like the AD823 or AD827. Any feedback or recommendations would be appreciated.

thanks.
jwha
richingoth
326 posts
 
Here is the link to the product date sheet:

http://www.analog.com/UploadedFiles/Data_Sheets/31592213475495AD8610_20_d.pdf

Regards,
Rich
s23chang
617 posts
 
The only difference between the AD8620A vs AD8620B is the voltage drift per changing temperature ( 0.8 to 3.5 uV/C vs 0.5 to 1.5 uV/C) If that's critical then it is worth the price. Temperature range from -40C to +125C
audioengr
3,282 posts
 
S23Chang wrote:
"After done much research, I found the AD8620 has the best spec."

Specs don't tell all. The on-die power delivery is what makes a great op-amp.
psychicanimal
1,738 posts
 
Eldart is a riot!
s23chang
617 posts
 
Agree spec is not always the best gauge. However, I read many postings that majority of them prefer the AD8610/AD8620 over OPA627 from their setup. I'm not sure it has to do with spec or how they setup the Op-amp. I know the decoupling cap choice can also vary the sound. I've tried many different values and got very different results. Instead of paying the super high price to test, I got the AD8620 to start. I'm not expert here. You should really check diyaudio website. There are thousands of postings regarding to op-amp choice in the gain card type amp to cd players.
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