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post #1096 of 1140
Quote:
Originally Posted by ecohifi View Post

It be interesting for you to compare the Burson and Dexa to the LME 49720/49860,  these will cost you a fraction of what the Dexa and I am interested in someone to compare them!

 

...or the 49990, which are better-sounding upgraded versions of the 49720/49860.

post #1097 of 1140
Quote:
Originally Posted by Shahrose View Post

 

...or the 49990, which are better-sounding upgraded versions of the 49720/49860.

The LME 49990 is used in the NAD M51,  they are good but I found them to be thin and lacking in definition on the low end, they are also more critical in set up and tend to be unstable. This is why I have never tried it in the EE.  The 49720 are robust in stability and have better low end definition,

post #1098 of 1140
Quote:
Originally Posted by ecohifi View Post

The LME 49990 is used in the NAD M51,  they are good but I found them to be thin and lacking in definition on the low end, they are also more critical in set up and tend to be unstable. This is why I have never tried it in the EE.  The 49720 are robust in stability and have better low end definition,

 

I've tested all extensively in the Minimax. The 49990 just sound like airier, more detailed versions of the 49720. They're all stable, and none of them are thin-sounding to me. In fact, tone is very similar among all of them. Technical performance is the main difference.

post #1099 of 1140
Quote:
Originally Posted by Shahrose View Post

 

I've tested all extensively in the Minimax. The 49990 just sound like airier, more detailed versions of the 49720. They're all stable, and none of them are thin-sounding to me. In fact, tone is very similar among all of them. Technical performance is the main difference.

Yeeep, thats what I did and thats what I thought, then you go back to the 49720 and find out the presentation exceeds the 49990 especially in base definition.  In the M51 there are areas where the 49990 have polystyrene caps for RF and they are not for the audio path!  If its stable in your EE then leave it, dont change.  If you want airier and detail, try the ADA 4627-1brz, this chip is better than the 49990 IMO but its expensive! eek.gif

post #1100 of 1140
Quote:
Originally Posted by ecohifi View Post

Yeeep, thats what I did and thats what I thought, then you go back to the 49720 and find out the presentation exceeds the 49990 especially in base definition.  In the M51 there are areas where the 49990 have polystyrene caps for RF and they are not for the audio path!  If its stable in your EE then leave it, dont change.  If you want airier and detail, try the ADA 4627-1brz, this chip is better than the 49990 IMO but its expensive! eek.gif

 

In the M51 or Minimax? I'm only referring to the latter for the purposes of this thread. I know atleast 8-9 people who swapped between both opamps and all of them preferred the 49990 (incl me). Check also on audiocircle and other forums which have a larger following of the EE DAC than Head-Fi. They all say the same.

 

I didn't get a chance to try the 4627 unfortunately. After going through something like 15 different opamps (and many more combinations) I kept coming back to the 49990, so I just left it there after a while and stopped experimenting. For me, the two things that made the biggest improvements in the DAC were those opamps, and the Tunsgram or Amperex E80CC tubes.

post #1101 of 1140

The M51 comes stock standard with 49990 and a TL082 for RCA buffer. 

 

Im going to try the AD823A, LME 49860 and the LME 49880 next...  But not in the EE mini max!

post #1102 of 1140

That's cool, but how the 49990 performs in the M51 has nothing to do with how it sounds in the EE Minimax DAC. This thread is not about the NAD M51. They each have different specs and requirements.

post #1103 of 1140

I'd like to know why most of these fet opamps, especially when mounted on Brown Dog adapters for dual application in U1/U2, get so darn hot. Doesn't that indicate oscillation? Non of the bi-polars or discretes that I've tried do this.

post #1104 of 1140
Quote:
Originally Posted by Turn&cough View Post

I'd like to know why most of these fet opamps, especially when mounted on Brown Dog adapters for dual application in U1/U2, get so darn hot. Doesn't that indicate oscillation? Non of the bi-polars or discretes that I've tried do this.

Which ones have you tried, not all go hot in the EE!

post #1105 of 1140

Questkon, if the  LME49990 duals go into the U1/U2 as mentioned above, do you also have to have single LME49990 opamps  mounted on the U3/U4 slots?

Would a combination of two different types of opamps in the two different sets of U1/U2  and U3/U4 work, but create a different sound?

 

thanks.

post #1106 of 1140
Quote:
Originally Posted by Carlsan View Post

Questkon, if the  LME49990 duals go into the U1/U2 as mentioned above, do you also have to have single LME49990 opamps  mounted on the U3/U4 slots?

Would a combination of two different types of opamps in the two different sets of U1/U2  and U3/U4 work, but create a different sound?

 

thanks.

No you dont have to change U3/U4.  Once you have implemented U1/U2 with LME 49990 you will be tempted to change U3/U4.  As any modern opamp is better than the stock

post #1107 of 1140

Does anyone know if the OPA637 will work in the output stage?  I am using an OPA627 currently and am curious about the potential for HF extension of the the OPA637 but not sure if the opamp would be stable in this application.

post #1108 of 1140

I guess I'll try my luck at an opamp question.

 

Why Cimarron's "Brown Dog Adapters?"  Is there any reason to avoid cheaper options like those listed on eBay?

 

I want to opamp tweak my "Plus".  If I go the Cimarron route, it gets pretty expensive.

 

If I go the cheaper route, I can get tons of combinations which is appealing.

 

Any thoughts?

post #1109 of 1140

Before you go and spend a fortune on Brown Dogs or discrete opamps you could give the LME49710/20 single/dual combo a try. They're cheap, don't require adapters and available from Digikey. IMHO they are in the same ballpark as the well liked LM49990s which are only available in SOIC form.

post #1110 of 1140
Quote:
Originally Posted by Turn&cough View Post

Before you go and spend a fortune on Brown Dogs or discrete opamps you could give the LME49710/20 single/dual combo a try. They're cheap, don't require adapters and available from Digikey. IMHO they are in the same ballpark as the well liked LM49990s which are only available in SOIC form.


Thank you, I will look into that. I have already spent a lot of money on opamps. I have tried Burson and DEXA in my Plus. I'll look into Digitech.

 

Now I want to get some singles to compliment. I was just wondering if there is any benefit buying from Cimarron? I assume they are better quality, but does it translate to better sound?

 

Regarding eBay. I guess the main issue is avoiding fakes? 


Edited by ecapsretliab - 7/21/12 at 8:52pm
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