Tweakers' Asylum

Great info

71.254.154.253

twl168

In Reply to: RE: film cap brand? posted by Pars on June 21, 2007 at 11:48:55

So how do the sound compare among different op you tried?

From my reading, I noted general comment on ad826 is that is is more audiophile, more high, tigher bass, greater details and wider soundstage. And on opa2604, it is "sweet"!! Is that your finding as well?

How about LM6172 and LM4562?

Just think about how many options I can have rolling the op brings excitment. Is it true that each op will require run in period to function its fullest? How long would that be? I am assuming that run in is for the op, so is it correct that if an op is fully run in, say 100 hours, then if I take it out and later insert it again, it would be considered as already run in or do I need to go through the process again?

What is a discrete? Seems complicated from the name suggested.

Thank you so much for great info and help.

Follow Ups:

RE: Great info - pars 12:30:52 06/21/07 (5)
As I said, I never tried the 2604s. The three that I mentioned sound more alike than different. The LM6172s are probably the most neutral or analytical of the bunch (and the crankiest, being bipolar input). Check any opamp you put in for excessive heat (since with the DC offset already present in the stage, you can't judge by that). If an opamp gets hot, chances are it is oscillating, which is a bad thing.

I'm not much of a believer in break in, so no comment there.

A discrete I/V stage is just that... discrete components. Search diyaudio.com or diyhifi.org for jocko's simple I/V stage, the Pass D1, etc. Commercially, there is the LC Audio zapfilter.
- Thanks, I will try LM6172 too. Question on Oscillating and Sorbothane - twl168 12:43:29 06/21/07 (4)
  Most neutral sounds good to me. I will give it a try as well.
  
  If an op gets hot, and too much oscillating, any way to reduce the oscillating? Or just forget about that particular op?
  
  I also remember someone mentioned putting some kind of sorbothane on top of the chip, is that for solving oscillating?
  
  Many thanks
  - RE: Thanks, I will try LM6172 too. Question on Oscillating and Sorbothane - pars 14:02:44 06/21/07 (3)
    The bypass capacitors are one primary means of attepting to control or prevent oscillation. If the opamp is oscillating, you do not want to use it. Barring access to a scope, you can also measure the current draw and compare it to the datasheet to determine whether it is oscillating or not. Or heat... as they will heat up.
    
    The sorbethane, etc. is not to combat oscillation but vibration. Unrelated.
    - Thanks for clarifying - twl168 15:30:17 06/21/07 (2)
      Thank you very much for all these info
      - RE: Thanks for clarifying - zanash 18:13:44 06/21/07 (1)
        
        In Reply to: RE: Thanks for clarifying posted by twl168 on June 21, 2007 at 15:30:17
        
        read this .....
        
        http://www.zero-distortion.com/start.htm
        
        choosing op amps
        
        wow, so much info. a must read for newbie - twl168 20:50:28 06/21/07 (0)
        
        In Reply to: RE: Thanks for clarifying posted by zanash on June 21, 2007 at 18:13:44
        
        Many thanks. Great site and a must read for newbie like me.

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