[ROBSCIX]

Have you checked the spec sheet of the LT1028?

They are a single channel opamp, IIRC. They will need an adapter.

 

[leeperry]

ahhhhh, I checked so many LT datasheets that I mixed them up

I guess I'd need 2 adapters like this : Single-to-dual Op-AMP Adapter - DIP version (p/n 021001)

but I'm not sure they'd both fit in the I/V...plus I'd need 2 more LT1028 samples.

 

[leeperry]

this guy asks US $29 shipped for 4xLT1028CSW on DIP8 adapters : 2x Mono to Dual OPAMP 2x LT1028 -> dual-opamp OPA627 - eBay (item 270425754451 end time Aug-12-09 01:46:17 PDT)

rather tempting

 

[Pluto2]

LT1028 is not unity gain stable, right? So not fit as a buffer I suppose. And the unity gain stable LT1027 doesn't sound as good? Please correct me if wrong : )

And need to clarify this...... about the metal can LM4562 vs EARTH story..that opa-earth was mine, and we tested both in a T-AMP setting. But the Earth had only a few hours of burn in, and so it was not a fair trial. Incidentally , I think Maijkel might also have not given earth the sufficient burn in time for his testing too......
Anyway, to make the long story short, a gentleman in this forum recommended
the LME49710 to me and said it's very close to earth's sounding , and I bought a pair for this friend to try out in his new DAC, which he liked so much and said if he were listening to analog from his CDs which sounded like his 300B amps....with smooth highs and great resolution.
The DAC had a built in NE5532, and later on he switched to a AD845sq but he didn't like it though. His understanding is that his already high resolution system is slightly light in bass, and so that NE5534 complemented it but not the nice AD... So it's all system dependent : )
And, Initially I wanted to replace all my 12 opamps with discretes in my system, but learning from Majkel's findings, I didn't bother.... : )

 

[ROBSCIX]

Quote:

Originally Posted by leeperry /img/forum/go_quote.gif ahhhhh, I checked so many LT datasheets that I mixed them up I guess I'd need 2 adapters like this : Single-to-dual Op-AMP Adapter - DIP version (p/n 021001) but I'm not sure they'd both fit in the I/V...plus I'd need 2 more LT1028 samples.

Good thing you got it figured out. May have possibly ruined the circuit if you had of installed them.

 

[Pluto2]

Typo sorry, ad843SQ rather....
BTW, those Audio-GD discretes all run in class A, and they all draw over 25mA each(single amp).....

 

[ROBSCIX]

Quote:

Originally Posted by Pluto2 /img/forum/go_quote.gif LT1028 is not unity gain stable, right? So not fit as a buffer I suppose. And the unity gain stable LT1027 doesn't sound as good? Please correct me if wrong : ) And need to clarify this...... about the metal can LM4562 vs EARTH story..that opa-earth was mine, and we tested both in a T-AMP setting. But the Earth had only a few hours of burn in, and so it was not a fair trial. Incidentally , I think Maijkel might also have not given earth the sufficient burn in time for his testing too...... Anyway, to make the long story short, a gentleman in this forum recommended the LME49710 to me and said it's very close to earth's sounding , and I bought a pair for this friend to try out in his new DAC, which he liked so much and said if he were listening to analog from his CDs which sounded like his 300B amps....with smooth highs and great resolution. The DAC had a built in NE5532, and later on he switched to a AD845sq but he didn't like it though. His understanding is that his already high resolution system is slightly light in bass, and so that NE5534 complemented it but not the nice AD... So it's all system dependent : ) And, Initially I wanted to replace all my 12 opamps with discretes in my system, but learning from Majkel's findings, I didn't bother.... : )

I have a few dual LME49710HA modules I built up the other night and they are great sounding opamp. I have never compared the two, the Earth and LME but both units are great for audio work.

 

[Pluto2]

Oh, that LM4562 metal can does go a few notches up compared to its plastic counterpart but so is its price tag : )

 

[leeperry]

hummm, the 497222 has a 0.00002 % THD.....the 49720 was 0.00003 %

anyway, I still think that the 49720 soundstage is not natural at all! so I don't expect a Earth OPA to "top" it....apparently it'd give a more analog-like audio, which is not what I'm looking for -I think-. I want that digital HUGE magical sound the 49720 gives.

and some ppl say that the bass is not bloated on the 49720, it's just that it's very tight....and apparently it's very dependent on its surrounding circuit.

I still think that the bass is far more natural on the 2111, that's for sure! but I'm not sure whether another op-amp could give the same surreal sound as the 49720, w/ better bass response?

I tried the 49720HA, the bass was overblown and the trebles were not as clear as the NA.

maybe that guy selling the LT1028 on ebay would be my golden ticket! I see he also does it for the OPA627...and running two singles gives better ground shielding, hence better SQ

I keep reading that the SS is more 3Dish and that the bass response is much better on the 1028 than on the 4562...oh my

 

[leeperry]

but then the guy says that the mids and details are far better on the 4562 than on the 1028...ideally he'd like the soundstage and the bass response of the 1028 w/ the mids and details of the 4562. no free lunch here

I still think that the 4562 cannot be topped w/o drawbacks...bass response seems to have a very high price in the op-amp world.

and tbh the 49720NA sounds mind blowing on my setup...except that the bass is flabby, but maybe that's how it was on the record to begin w/! it's easy to distort it and make it louder on purpose...I might just use OzoneMP to do that

I read some ppl on diyaudio.com saying that they had built 2 DAC's, one w/ the 4562 in I/V and the other one w/o any op-amp....and they said that the 4562 was giving the same exact sound as the other

I think I'll wait for my LT1355/LT1364/LT1358/LT1361/LT1469 samples, and see if any of them makes me forget about the 4562 mids/soundstage....otherwise I'll put it back on, and call it day

 

[leeperry]

well, getting crazy compressed bass on the 49720NA is not as hard as it looks

I've bypassed every filter but the bass compression, best of both worlds! analog compressed bass and very clear trebles/soundstage

 

[Pluto2]

The belt now goes to OPA2727, and not on LT1355 any more ? So yesterday's hopeless got beaten up by today's desparecidos, haha : )
Would you say OPA2727 is a more all rounder than opa2211?

 

[Pluto2]

so for +- 15v, what would be your possible top 3 list?

 

[leeperry]

Quote:

Originally Posted by desaparecido /img/forum/go_quote.gif The OPA2727 just lets you forget about opamps

it didn't work for you, now did it ?

and are you Mule? Search of All Forums

many ppl call the LM4562 cold and sterile, I call it uncolored...hum, that 49722 looks very sexy...even lower THD ahmagad

PS: I'm gonna ask a friend to put the soic8 LT1028/OPA211/LME49722 and LME49720HA on DIP8 adapters...that should give!

 

[leeperry]

well, the improved specs of the 49722 over the 49720 don't seem to come for free: diyAudio Forums - National opamp inflation - Page 1

I've got no idea of how my souncard would react