Tweakers' Asylum

RE: OPA1611

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bevo

In Reply to: RE: OPA1611 posted by danvegso on March 15, 2010 at 19:44:16

Any direct comparison to the BB 2132 or AD 823? And is the OPA 1611 8 pin?

Follow Ups:

RE: OPA1611 - danvegso 10:19:48 03/16/10 (4)
Hey bevo!

The opa1611 is an 8pin SOIC single op-amp.
Info @ http://focus.ti.com/docs/prod/folders/print/opa1611.html

As a comparison opa1611 vs. opa2132 I'll qoute a post from "Andrea" on the diyAudio forums:".....the opa2132 - it's an average opamp, with smallish soundstage yet a good midrange, if slightly lacking smoothness. The OP132UA (x2) would bring an improvement(.....) The opa1611/1612 is another class :-)"
Andrea qualifies this, speaking of the better-sounding opa2132p. I've not heard a "not p" version, so I'll defer.
My experience echos Andrea's using the 8pin DIP opa2132p.

Oddly, the SOIC package mounted on an adapter sounds better than the same type in a standard 8pin DIP. I have a few theories, but nothing that I can yet say with certainty.
The best option seems to be 2 SOIC single op-amps mounted on an adapter to 8pin DIP. My current fave is the ada4627-1BRZ, a single op-amp mounted as mentioned.
On the ada823; I don't have any to test, but a quick scan of AA shows a few threads on it. Here's one:
http://www.audioasylum.com/cgi/t.mpl?f=tweaks&m=122659
Dan

Edits: 03/16/10
- RE: OPA1611 - bevo 11:03:41 03/16/10 (3)
  Excellent info Dan - thanks. I recent'y modded an old Belles pre and put in an 8pin socket so I can find the best opamp for me. The BB2132 I have is actually the PA and I do like it, but I do also agree with the comments about soundstage/midrange. I wouldn't say it lacks smoothness in my application/system, though.
  
  I am very interested in trying out a pair of the 1611's but where can I find the adaptor for 2 of these into a single 8pin? I really don't want to DIY one. And where should I look for the 1611/1612? Thanks.
  - RE: OPA1611 - danvegso 11:40:55 03/16/10 (2)
    Hi bevo!
    Glad I could be of some help.
    I remember the Belles equipment---excellent stuff!
    The adapters I use are from an eBay vendor. Search for item #230379640581 and you'll find what you need.
    You can purchase the opa1611s from TI, or the others listed at:
    http://focus.ti.com/docs/prod/folders/print/opa1611.html#inventory
    
    Should cost < $2.00 each (X2) plus shipping. There may be a minimum order, though.
    If soldering these teeny-tiny SOICs is a pain, you might try the opa1612 when they come off b/o.
    If you like a bit warmer sound, with little loss of detail, you might also try the LT1364 (BiPolar) in an 8pin DIP. Another good choice might be the ad8022arz (SOIC, so you need a single DIP adapter, but least you only have to solder 1 instead of 2 on the board). It also has a nicely balanced sound- a BiPolar as well.
    If you like a bit more detail, the opa2111 (DiFet) works well, but, to me, a bit fatiguing after a few hours listening.
    Dan
    
    Edits: 03/16/10
    - RE: OPA2111 - Panelhead 17:40:11 03/16/10 (1)
      I first felt the OPA2111 was sharp sounding. Yanked them as the buffer/balanced to SE converter in my amp modules. Replaced with OPA2107. This was an improvement when used just as a buffer.
      Later got a balanced pre and found the 2107 a little rolled on top. Reinstalled the 2111 and they are perfect. Very revealing, small changes upstream jump out.
      Maybe not an opamp for every application. But magic in some.
      
      George
      - RE: OPA2111 - danvegso 18:42:30 03/16/10 (0)
        
        In Reply to: RE: OPA2111 posted by Panelhead on March 16, 2010 at 17:40:11
        
        Hi George,
        
        I had the same experience with the opa2111 so far as the sharpness. I found that, in my case it was oscillating a bit (no 'scope at that time and place, so I couldn't tell you why/where/how much).
        I DID find that a local bypass w/.1uf 50V PS caps on both rails calmed it right down.
        I never went back to that project (a preamp/DAC), but I remember the guy who continued playing with that circuit said he did well with an opa2107-very stable, neutral presentation.
        
        Dan

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