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Audio-gd discrete op-amps reviewed: OPA-Earth, OPA-Moon, OPA-Sun v.2 - Page 4

post #46 of 392
2/7/09 at 1:42pm
Quote:
Originally Posted by back View Post
guys i have sent him emails before and he responded very fast.

this time it`s 4 days and still no answer.
Did you get the confirmation email that Audio-gd received it? If so maybe it just got lost in their queue of emails to answer or the response was emailed to you but never made it. If you never got that confirmation then it's likely they never got the email. You could try sending it again.
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post #47 of 392
2/7/09 at 8:24pm
Quote:
Originally Posted by csroc View Post
Did you get the confirmation email that Audio-gd received it? If so maybe it just got lost in their queue of emails to answer or the response was emailed to you but never made it. If you never got that confirmation then it's likely they never got the email. You could try sending it again.

no i didn`t and i have sent two times.
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post #48 of 392
2/7/09 at 8:31pm
Try another email address if you haven't. I've always gotten their confirmation email instantly.
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post #49 of 392
2/8/09 at 3:39am
It's probably ended up in your spam folder.
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post #50 of 392
2/8/09 at 7:12am
Because this thread has already gone astray, allow me to keep it on track with my latest headamp set ups: two OPA Moon and one OPA Sun v2.

To get a higher current, I changed the precision rail splitter IC's with Sijosae's discrete rail splitter module (thanks to my friend, he made it for me) The original rail-splitter ICs who provide less currents actually worked fine with 3 HDAMs plus 3 op-amps, but this discrete rail-splitter module seems to "widen" the sound...







It sound..... just wonderful....
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post #51 of 392
2/8/09 at 8:24am
Thread Starter 
Thanks, Ron. What are these SOIC chips?
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post #52 of 392
2/8/09 at 9:00am
Quote:
Originally Posted by majkel View Post
What are these SOIC chips?
All these SOIC chips biased to Class-A, part of gain stage for L/R/GND channels, it's a combination of AD8066 / OPA2134 / AD8397 or OP270.
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post #53 of 392
2/9/09 at 6:06am
Thread Starter 
Isn't it too many opamps to have great sound? The fewer of them, the better. Also, try removing the tantalum capacitors from analog circuits wherever they are and replace them for some decent electrolytic caps. They pollute analog supplies badly while they rock for some digital supply bypassing - not everywhere of course.

Blog style review update - 2/9/2009

I upgraded a bit my digital source yesterday because of what I learnt on the meeting with my friend owning the Accuphase DP800/DC801 combo. I tried the DP800 as the CD transport for my DAC and realized it was significantly better. However my actual preferences regarding parts in my DAC remained unchanged. Regarding the integrated op-amps as well but the classification needs to be revised. I know I change my mind pretty often due to new lessons learned each time but for today...
Absolute number one: LME49860
Absolute number two: Audio-gd Sun v.2
They are both pretty similar sounding, with the LME being a bit richer harmonically and the Sun v.2 being slightly more analytical and showing very slight instability on vocals only. Actually with a better digital source (it wasn't that bad anyway) it increased the distance to the OPA Earth and the OPA Moon, not to mention I prefer it to pairs of the OPA211 and the AD797BRZ now.
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post #54 of 392
2/10/09 at 12:21am
so the LME49860 is your favourite at the moment? should I look for the MDIP or the SOIC version? are these Dual op amps?

Are these swappable with say an lm4562?

thanks
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post #55 of 392
2/10/09 at 6:24am
Thread Starter 
Quote:
Originally Posted by Bleemv1 View Post
so the LME49860 is your favourite at the moment? should I look for the MDIP or the SOIC version?
I tested DIP version.
Quote:
are these Dual op amps?
yes
Quote:
Are these swappable with say an lm4562?
yes
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post #56 of 392
2/10/09 at 8:52am
One of the guys involved in the development of the LME-opamps are active at diyaudio.com. He claims the metal can versions sound significantly better. Have you tried one of those? Do you know where to get them?
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post #57 of 392
2/10/09 at 11:20am
Thread Starter 
farnell.com if any but there is a lot of metal can versions of op-amps like OP27, OPA627, OPA111, LM4562 but they are damn expensive. I'm not sure on the other hand if the LME49860 exists in the can package.
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post #58 of 392
2/11/09 at 9:11pm
Copying and pasting from http://www.head-fi.org/forums/f5/des...ml#post5412359

Quote:
Originally Posted by jjlucas76 View Post
I have tried the OPA627BP on my headamp to replace a couple of AD797AN and the difference was quiet stunning in terms of speed and quality, but the bass and the sound coming from dark were missing. lucky for me I have ordered together with them a couple of AD797BRZ and 2 nice SOIC to DIP converters.

The results? uhm I need to say that who was saying that the AD797BRZ are better then the OPA627BP was right and I can only confirm that they actually have both qualities from the OPA627BP and the AD797AN. Excellent choice for your preamp or DAC.

Cheers.
My feelings about the 3 hdams' characteristics are quite similar with your review, so I am thinking about trying out the LME49860.
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post #59 of 392
2/12/09 at 2:09am
I thought I read somewhere that the LME49860 is the same as the LM4562 but with slightly better tolerances or something? are these people wrong?
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post #60 of 392
2/12/09 at 7:24am
I thought it was a well known fact that LME49720 is a renamed LM4562. Isn't it so? A former National employee, active at Diyaudio.com, claims that LME49860 also is exactly the same opamp as LM4562. The only difference is that they're tested to assure they withstand a slighly higher voltage supply, and if you don't need this higher voltage rating you could just as well use LM4562.

So threre's really no reason to believe LME49860 is a superior chip, and if we like the sound of them and want to make the most of it we should go for LM4562, LME49720 or LME49710 metal can version.

Here's the discussion at Diyaudio
diyAudio Forums - National opamp inflation - Page 1
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Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Audio-gd discrete op-amps reviewed: OPA-Earth, OPA-Moon, OPA-Sun v.2