The Opamp thread

[Nintendo Maniac]

Let's make it simple, this is the exact LME49990 module that I'm using:
http://www.ebay.com/itm/190999739495
 
So regarding the LT1122, I believe this would be the right form-factor:
http://www.ebay.com/itm/150859013571
 
 
(you know when you've been doing too much with CPUs and motherboard when you keep typing LGA49990 instead of LME49990 >_>)

 

[SpudHarris]

Right so a dual. I will see what spares I have...

 

[Nintendo Maniac]

I will see what spares I have...

 
Are you implying that you're considering selling some of your spare op amps?  Your location says the UK though, and I'm in northeast Ohio.  Therefore, wouldn't shipping easily cost more than the amp itself?

 

[leeperry]

  So I was looking for an op amp that would almost be an opposite to the LME49990 - not opposite as in "it'd sound crappy" ,but like where "cold and analytical" is the opposite of "warm and embracing".

 
OPA2107 / 627 & 2132 come to mind but all cheap 627's are fake, gotta buy them from an authorized dealer.

 

[Nintendo Maniac]

   
 all cheap 627's are fake, gotta buy them from an authorized dealer.

 
Very aware of this, I read several of your own old posts stating this very thing.
 
Speaking of OPA6xx I read another post stating that the OPA602BP seemed kind of between the LGA49990 and the LT1122, so I was thinking of perhaps getting the LT1122 now and then getting the OPA602 afterwards.
 
As for the OPA2107 and OPA2132, I had indeed researched both, and both seem to have several North American ebay resellers that are below $10.
 
 
EDIT: I will admit though, one thing I had liked about the LT1122 was that it didn't seem to be very common and several people said it was the only LT op amp they liked, so I kind of wanted to possibly get one of those while such a thing is still possible (the OPA op amps seem extremely plentiful by comparison).
 
EDIT 2: Hmm, it would seem that the OPA2107 isn't quite as plentiful as some of the other OPA amps, particularly DIP8 dual version.  The following seems to be the only "Buy it Now" North American listing for a single unit of a DIP8 dual OPA2107 under $15:
www.ebay.com/itm/181446016408

 

[SpudHarris]

Hey, karma points is all I need

Drop me a PM with your address and I will drop something in the mail...

 

[SpudHarris]

OPA2107 / 627 & 2132 come to mind but all cheap 627's are fake, gotta buy them from an authorized dealer.

Hey you!! How you doing? Are you still loving the OPA602CM?

 

[Nintendo Maniac]

Drop me a PM with your address and I will drop something in the mail...

 
...lolwut, head-fi's acting up again where I'm not getting instant email notification of replies.  And no, it's not in my email's spam folder either.
 
Anyway, I will PM you momentarily.
 
EDIT: PM sent.

 

[Nintendo Maniac]

Super-duper apologies for a double post, but I was wondering what people use for storing their op amps?  I've personally discovered that a CPU clamshell for PGA processors with the foam for the pins works great for DIP8 op amps:
 

 

[leeperry]

I read another post stating that the OPA602BP (..) it would seem that the OPA2107 isn't quite as plentiful as some of the other OPA amps

 
Yeah, 602BP is quite fun too. Personally I remain quite wowed by 1641, it's a new design and it sounds really great. TI advise it for high-end BD players and it's very cheap so it's well worth the 10 mins to solder two onto an adapter.
 
2107AP can sound very bassy and thick depending on the application, I've been quite impressed when used as I/V within PCM1792A designs.
 
The only opamp from LT that was specifically designed for audio is LT1028 AFAIK, LT1363 is still worth a shot though IME.
 
Of course it's all based on blind rolling so YMMV, it's just sheer fund to solder chips, pop them in and instantly hear the result of your work......it's lego for bored audiophiles, plain fun really

 

 

[leeperry]

And let's not forget OPA827, many ppl rave about it as one of the very best chips for DAC filtering and sometimes it really does the magic with stunning resolution and highly textured deep bass IME

 
Several cheapo DAC's shipping with OPA2134 and the likes can really benefit from 827 IMO: http://www.ti.com/product/opa827

After i replace opa2107 with this OPA827 in a dual - single adapter to my DIY amplifier . I keep listening till around 40-50 hours and i feel that my amp sound very richer and smoother when compare to the old opa2107 

 

[Mad Max]

  Super-duper apologies for a double post, but I was wondering what people use for storing their op amps?  I've personally discovered that a CPU clamshell for PGA processors with the foam for the pins works great:
 

 
I use the iBasso cases from opamp adapters I've ordered from them in the past.  The plastic boxes with foam that contain opamp samples from ADI are also quite good, even for DIP adapters with opamps soldered to them.

 

[Nintendo Maniac]

   
even for DIP adapters with opamps soldered to them.

 
Oh, I was specifically referring to DIP adapters actually.   I've no experience with single stand-alone non-DIP op amps, so....

 

[Mad Max]

   
Oh, I was specifically referring to DIP adapters actually...

 
Same here.  Empty adapters, DIP opamps, DIP adapters with whatever opamps, and so forth.  Excluding "discrete" opamps.

 

[Pwn3r4Life]

Is there a community chart somewhere? Like a big list of most of the op amps, as well as price, where to buy (I've heard Ebay, but I've heard don't use Ebay), and their price. That would be extremely helpful. I've heard the OPA827, OPA627, OPA-Earth, OPA-Moon, LT1355, and the MUSES 8920 are all great. But I can't find a whole lot about where to buy any of them, or information about the products themselves that isn't in the form of charts that I can't understand. Anyone care to help a noob?