OPA627/AD8610 comparison

[Bgt]

changed my DAC(Elektor2000) analog output chips from OPA627 to AD8610. There are 4 of them 2 for the I/U conversion and 2 for the filter. Ok the AD8610 sounds bright. Sometimes a bit too bright. The Sssss sounds are not so nice as on the OPA627. Tried different speakers and the symtom stays. Amps are 2xUCD400 with AD8620's and a passive preamp. Dac unit is snubberized.
Anyone has the same experience?

 

[Russ White]

hmmmmm

Everything is so dependant on outside factors, but actrually I have noticed exactly the opposite.

I actually prefer the 8610/20 as much warmer less sybilant than the 627/637.

And now I am trying the LT1115(low voltage noise) and LT1028(low current noise) both with great success. So much so that I find it equal to the 8620 on everything I have listened to so far.

Also I can state that the LT1010 seems to be at least as good as the buf634, especially when fully biased.

 

[analog_sa]

Yes. The 8610 improves greatly with a buffer under the feedback loop. Imo the end result is better than a 627 alone or a 627+buf. It certainly is system/taste dependent.

 

[Bgt]

but actually I have noticed exactly the opposite

Funny, how, probably outside influences, play such a role in the listening experience.
I will keep on testing it with all kind of music to see if the difference remains .

 

[Peter Daniel]

the AD8610 sounds bright. Sometimes a bit too bright. The Sssss sounds are not so nice as on the OPA627.

I was under exactly same impression when I tried both chips in ML380 preamp. I was running AD8610 at 15V rails, some say 12V is better.

 

[Russ White]

15V is above the max on the 8610/20 datasheet. In my tests this opamp sounds best between +/-10V and +/-12V above that and it gets nasty. For kicks I even tested it down to +/-5V and it still sounded great.

Above 12V the 627/637 are definately better. I still am not convinced the 627/637 are any better than the LT1115. But they are indeed much better than the opa227/228.