[DR650SE]

I have 4 sets of op amps, and am currently using the Op-amp OPA627AP. I switched them up a few times, but honestly I would need more time with them. I really couldn't tell much differance between any of the op amps. Maybe I was tired. Or maybe my hearing just isn't that good due to my 4 military deployments. Not an easy time on the ears i'll tell you that much

 

[ph58]

I have 4 sets of op amps, and am currently using the Op-amp OPA627AP. I switched them up a few times, but honestly I would need more time with them. I really couldn't tell much differance between any of the op amps. Maybe I was tired. Or maybe my hearing just isn't that good due to my 4 military deployments. Not an easy time on the ears i'll tell you that much

OK , thanks , it seems that the OPA627Ap are the most musical , have more question ,  are they easy to change , do i need a DIP Extractor ?

 

[DR650SE]

They are easy to change. Simply pull them straight up. Be very careful to pull straight up. any sideways movement can cause the pics to bend very easy as they are very thin.

 

[ph58]

OK , i think that's better with a DIP Extractor , are they marks on the socket and on the opamp to replace properly ?

 

[DR650SE]

This may help more then me explaining it. I opened my amp and snapped these with my phone camera so the quality may not be great. There's pics of my different opamps for the UHA 6S.MKII.

In the amp are the OPA627AP opamps.

Sent from my XT912 using Tapatalk

 

[headwhacker]

I tried OPA627AP, AD4627-1A and AD797. Of all the 3 opamps, I like the AD797 better. It doesn't emphasize any single part of the FR curve. It feels like it has better end to end extension and is flatter.

OPA627AP seems to have a bit of a bump on the upper to mid bass and rolls off earlier on the high end compared to AD797.

AD4627-1A seems to be a bit brighter than the other 2 and has the same bass response as OPA627AP has.

 

[DR650SE]

I tried OPA627AP, AD4627-1A and AD797. Of all the 3 opamps, I like the AD797 better. It doesn't emphasize any single part of the FR curve. It feels like it has better end to end extension and is flatter.



OPA627AP seems to have a bit of a bump on the upper to mid bass and rolls off earlier on the high end compared to AD797.



AD4627-1A seems to be a bit brighter than the other 2 and has the same bass response as OPA627AP has.

 


Hmm, I may have to spend more time with the AD797 and try it out. I havn't spent much time with the other opamps.

Can somone tell me which OPAMP I have that is blue? It is in the pic but the things are so small that it is hard to make out the writing with just my eyes. The camera helps but still a little blurry. They all came with my amp when I bought it off a fellow head-fier.

 

[namaiki]

Could it be a LME49990MA?

 

[DR650SE]

Thanks. It really does look like that.

Sent from my XT912 using Tapatalk

 

[headwhacker]

Looks like UHA-6SMKII can still be improved.
 
http://www.leckertonaudio.com/blog/2014/6/5/new-dual-to-single-op-amp-adapter-provides-high-performance-option-for-uha-6smkii

 

[duydangle]

Can somone tell me which OPAMP I have that is blue? It is in the pic but the things are so small that it is hard to make out the writing with just my eyes. The camera helps but still a little blurry. They all came with my amp when I bought it off a fellow head-fier.

That's a LME49990
 

 

  Looks like UHA-6SMKII can still be improved.
 
http://www.leckertonaudio.com/blog/2014/6/5/new-dual-to-single-op-amp-adapter-provides-high-performance-option-for-uha-6smkii

 
So great to see this. Many great opamps but only have dual version. But the decrease of the usage time is huge.

 

[Theogenes]

Looks like UHA-6SMKII can still be improved.

http://www.leckertonaudio.com/blog/2014/6/5/new-dual-to-single-op-amp-adapter-provides-high-performance-option-for-uha-6smkii

Wow, very cool. Moar powwwer, lower distortion, and battery life still sounds good, even though it's not as astronomically good as before. Be interesting to hear listening impressions for sure.

 

[headwhacker]

Yeah good news indeed for those who use or plan to use low impedance planars which need lots of current.

 

[robm321]

Wow, very cool. Moar powwwer, lower distortion, and battery life still sounds good, even though it's not as astronomically good as before. Be interesting to hear listening impressions for sure.

 
Yes, very cool, indeed. 

 

[zolom]

I'm thrilled to report that this amp is compatible with the new Galaxy S5. I just plugged it in with a USB OTG cable and it works immediately, no changes in settings needed. Huzzah!

Do you notice Sound Quality improvment against the custom audio of the S5 ? (it should have a better DAC curcuit then that of the Leckerton 6s mk2)
 
Thanks