The Opamp thread

[Spacehead]

Quote:

Originally Posted by netsky3 /img/forum/go_quote.gif ...but...where????

omg if I post this here, soon they cost 30€ :O

Serving the community:

Partcon Verkkokauppa

 

[netsky3]

Quote:

Originally Posted by Spacehead /img/forum/go_quote.gif omg if I post this here, soon they cost 30€ :O Serving the community: Partcon Verkkokauppa

LOL!
damn is a shop in norway

 

[leeperry]

OPA637 is only stable for >4 gain, many designs can't get it to stabilize: Auzentech OPAMPS

OPA627BP is prolly your best choice

 

[Spacehead]

Quote:

Originally Posted by leeperry /img/forum/go_quote.gif OPA637 is only stable for >4 gain, many designs can't get it to stabilize: Auzentech OPAMPS OPA627BP is prolly your best choice

I use OPA552 succesfully in my PPA when I set gain to 5. So I assume the OPA637 works too.

I think in X-FI op amp works in inverting mode and gain is pretty low, about -3 I guess.

 

[leeperry]

oh sure, if you know what you're doing you can get any opamp to work anywhere....but for the average blind roller, OPA637 might easily end up being a total failure.

 

[Spacehead]

Quote:

Originally Posted by netsky3 /img/forum/go_quote.gif LOL! damn is a shop in norway

Actually in Finland. Too bad I couldn't help you, this message in front page: "And please note that we deliver only to Finland"

Should I buy dozens of them and do some ebay selling

 

[joe_cool]

Quote:

Originally Posted by leeperry /img/forum/go_quote.gif OPA627BP is prolly your best choice

I bought a pair of OPA627BP and tried them in my DAC as diff-to-single-ended output buffers and found them too "soft" for jazz and rock. Maybe for classical they would be just right; I should have tried that, I do have some.

 

[leeperry]

well I read that OPA867 was an improved version of 627, and I really didn't like it...I cannot stand those OPA/LME opamps anyway, they do everything wrong to my ears

 

[ROBSCIX]

Quote:

Originally Posted by Spacehead /img/forum/go_quote.gif I use OPA552 succesfully in my PPA when I set gain to 5. So I assume the OPA637 works too. I think in X-FI op amp works in inverting mode and gain is pretty low, about -3 I guess.

To Clarify, the OPA637 is stable for gains =>5 as mentioned in the spec sheet.

 

[ROBSCIX]

Quote:

Originally Posted by joe_cool /img/forum/go_quote.gif I bought a pair of OPA627BP and tried them in my DAC as diff-to-single-ended output buffers and found them too "soft" for jazz and rock. Maybe for classical they would be just right; I should have tried that, I do have some.

They are favorites to many people. I think it depends on other factors in the design. Some like them because they are smooth and soft as you said. Personally I like the OPA637 more if compatible in the same circuit.

 

[Mad Max]

Quote:

Originally Posted by ecclesand /img/forum/go_quote.gif I have a set of the AD744KN in my Parasound DAC. I did the output bypass mod and they sound fantastic. Did you do the same with yours or stock? I should give the metal can versions a try with the output bypass.

I tried output bypass with AD744 JN, KN, and AH and the mod changes the midrange tonality, killing their synergy with my ipod. Other than that, they sound great. I find that all three grades of 744 differ in their midrange tonality, but the metal can and plastic dip versions are very close to being the same and synergize best with my 6G ipod classic. The ceramic dip doesn't synergize quite as well.

 

[ROBSCIX]

..always another flavor!

 

[Mad Max]

 

[12Bass]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif I still like the OPA132AU as recommended by your friend and mine Andrea

Have a pair on a BrownDog... and don't find them much different than an OPA2132P. Not in the same class as OPA827, IMO.

 

[ROBSCIX]

Yeah, the OPA827 is a very good sounding opamp. Just made a set for a freind for his circuit.

In your opinion how do you think they compare to the OPA627?