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New Leckerton UHA-6S MKII Portable Headphone Amplifier Announced (Update User Impressions Added July 20th 2012) - Page 143

post #2131 of 2331
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 frown.gif
post #2132 of 2331
Quote:
Originally Posted by DR650SE View Post

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 frown.gif


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 ?

post #2133 of 2331
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.
post #2134 of 2331

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

post #2135 of 2331
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.

8ahemude.jpg

a2a2yjab.jpg

y6a9a3yn.jpg

sa4e4y6e.jpg

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post #2136 of 2331
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.
post #2137 of 2331
Quote:
Originally Posted by headwhacker View Post

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.

sa4e4y6e.jpg
Edited by DR650SE - 6/5/14 at 5:04am
post #2138 of 2331

Could it be a LME49990MA?

post #2139 of 2331
Thanks. It really does look like that.

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post #2140 of 2331

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

post #2141 of 2331
Quote:
Originally Posted by DR650SE View Post

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

 

 

Quote:
Originally Posted by headwhacker View Post
 

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.

post #2142 of 2331
Quote:

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.
post #2143 of 2331

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


Edited by headwhacker - 6/7/14 at 9:35am
post #2144 of 2331
Quote:
Originally Posted by Theogenes View Post


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. 

post #2145 of 2331
Quote:
Originally Posted by Bazirker View Post

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

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