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Audio-gd discrete op-amps reviewed: OPA-Earth, OPA-Moon, OPA-Sun v.2 - Page 5

post #61 of 392
Yeh I might have read that thread. Although I remember seeing some graphs comparing both the op amps and they were very slightly different...?
post #62 of 392
There are two versions of the AD797BRZ on farnell.com, one new one which is a low-noise version. Which version is the one to get or doesn't it matter?
post #63 of 392
Thread Starter 
I guess it doesn't matter. It's just a mess in their database. Beware of Newark option which costs much outside of North America. BTW, order the LME49860 for yourself. This one looks best to me and I didn't have it in the review time.

NelsonVandal, the LME49720 sounds different than the LM4562, and the LME49860 is better than both. BTW, you can perform a test: supply the LME49720 or LM4562 with +-22V rails and see if it's blown. If so, then it sure is a different circuit than the LME49860. BTW, some specs are a bit different.
Thanks for loaning the "AD797 clone" BTW. I have some impressions and will let you know later. Very nice job and sound.
post #64 of 392
Quote:
Originally Posted by Bleemv1 View Post
Yeh I might have read that thread. Although I remember seeing some graphs comparing both the op amps and they were very slightly different...?
You have to take the supplied voltage in consideration. The specs for LM4562 are measured at +/- 17V and LME49860 at +/- 18V and 22V. If they were measured at the same supply voltage they'd probably look exactly the same.
post #65 of 392
Thread Starter 
I compared specs for +-15V.
post #66 of 392
I took a look at the graphs in the data sheets, and most of them are identical. They must have used the same graphs for both LM4562 and LME49860, and if they did they must think that the amps are absolutely the same.
post #67 of 392
Thread Starter 
I think it's a bit of laziness. The datasheets are for the most part written by students being on internship. I remember many simple mistakes in datasheets from different brands. There is no reason to rely on them. What I think is that all three have the same schematic but are produced on different production lines with use of different silicon compound, giving higher acceptable voltage supplies and just different sound. It's like TLE2072 against TLE2082 - specs are identical, sound quite different.
post #68 of 392
"1. Yes the 4562 and LME49720 are identical. National changed the numbering system to go from 4 to 5 digits and since they would not give us a new name for the high performance series of parts we just changed the LM to LME (E for excellence). Also the High voltage parts are identical but tested and guaranteed to higher standards. Testing always costs more...can anyone say MIL Spec!"

diyAudio Forums - National opamp inflation - Page 3
post #69 of 392
Thread Starter 
I care for sounds, not specs. There is more difference between the LM4562MA and the LME49720MA than between any of these and the LME49860 while the latter is more refined than the other two.
post #70 of 392
so marjkel, are you now saying LME49720MA is better than the ad797brz? what are the characteristics of LME49720MA?
post #71 of 392
Thread Starter 
Quote:
Originally Posted by theBigD View Post
so marjkel, are you now saying LME49720MA is better than the ad797brz? what are the characteristics of LME49720MA?
No, I wouldn't say that but I like the OPA211 and the LME49860 a bit more than the AD797BRZ's but you know, these all are contenders to be the best depending on your tastes and the rest of the audio gear, as well as the OPA Sun v.2.
post #72 of 392
so what do you find so appealing about the lme49860? i might get a sample and try in my ef1. i am still waiting for earth and moor to arrive, came from china to LA going to oregon via NJ??? maybe i will get tomarro.
post #73 of 392
Thread Starter 
Timbre, transparency and resolution on fast, complex instrumental passages. This made even the AD797BRZ to suffocate slightly, the OPA211 was better in this field together with the NI product but the LME49860 is sounding more effortless.
post #74 of 392
just got my LME49680s. How long burn in did you put through it?

I don't really know if there's a difference. But maybe it is less bright than the LM4562. That's the feeling I'm getting at the moment. Maybe positioning is more defined as well. Can't be bothered A/B ing the chips :P
post #75 of 392
Thread Starter 
Maybe your equipment is not resolving enough? For me these are subtelties that matter. Also, I cannot tell how they differ both the LM4562 and the LME49860 from one piece to another within the type.
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