The Opamp thread

[leeperry]

just because ceramic is audiophile grade as we all know:
 
   
 
 
I thought I'd use a big copper heatsink, but ceramic is immune to EMI/RFI...I like that 

 
and the 1363 datasheet gives better thermal specs for CS8 over CN8, I'll check tomorrow how temperature goes..they were slightly warmer than my finger w/o cooling.

 

[buz]

So I just received an AD797BR from audjade. I'm wondering now, is it better to put it into my M-Stage (current OPA2134) or in my NG98 DAC Stage (current LT1028)?

 

[Mad Max]

Try out both, see which you like it in better.

 

[i_djoel2000]

can someone recommend me and opamp that has good high and low extension?

 

[leeperry]

 

can someone recommend me and opamp that has good high and low extension?

Where do you plan on using it? There's no "one size fits all"

 

 

[Mad Max]

Unless an HDAM fits in there. 

 

[leeperry]

oh yah, sure: http://www.head-fi.org/forum/thread/413748/audiotrak-prodigy-cube-has-anyone-heard-of-this/15#post_6251920

 

[svyr]

Any tips for Stax driver op-amp setups? (need to single ones I think). The SRM-300 I bought off neob has sockets fitted: 
 
Initially it had 2xLF 353N inside. 
 
Now it's running 2xLME49720HA but it sounds somewhat fatiguing.
 
neob said he was told 2xAD826 sounds nice in it.  (or rather may sound nice)
 
 
I was going to try my 2xOPA627BPs, but then I managed to snap one of the chip legs and it's stuck (the leg piece that is) in the adapter I used in my Aune mk2... Any tips on getting it out (It's inside the gold plated metal hole of the 2x to dip 8 adapter)?

 

[Yoga Flame]

 
Quote:

I was going to try my 2xOPA627BPs, but then I managed to snap one of the chip legs and it's stuck (the leg piece that is) in the adapter I used in my Aune mk2... Any tips on getting it out (It's inside the gold plated metal hole of the 2x to dip 8 adapter)?

Which pin? If you're lucky, it's pin 8, and you can just leave it off since it's not used by the OPA627.
 
Otherwise, maybe you could try soldering some scrap wire onto the stuck pin and then yank it out. Or is it stuck too deep inside?

 

[svyr]

 _
|_.|
 

 
The corner pin closest the dot indicating which side to insert the op-amp. (I have strange feeling it's pin 1)
(p.s. wow, big pic of the wrong op-amp, but I hope you understood which pin I meant)
 
p.s.s yep, it's rather deep. Guess I could still try the solder/yank method - worth a try before getting another 2xsingle to dual adapter. 

 

[Yoga Flame]

Yeah, the corner dot is pin 1. That's too bad. Should be fixable with some careful soldering though, as long as there's still some of the leg left. I would use a heat sink to be on the safe side.
 
 

 

[svyr]

It snapped in half. (i.e. just the thin bit of the leg, not the tick one)
 
Aside from the question about an op-amp for the stax, 
 
I also need one for the Aune mk2 now, since I broke the 627BP . Any advise?

 

[12Bass]

Pin 1 is for offset trim, so it probably is not used.  Chances are the the pins being used are pins 2,3,4,6, and 7.  

Perhaps be a little more careful next time... 

 

[svyr]

I should probably get the chip extraction tool... It's likely cheap and saves money. 
Tweezer-like or 'sucking pen' lol?
 
But yea... The opamps came with my used Aune mk2, so I didn't really realize I was handling ~$15...
 
Some of the other pins are slightly bent as well. Best way to straighten them? (or just leave them alone so they don't snap?)
 
Quote:

Perhaps be a little more careful next time... 

 
So, for alternatives for Aune and SRM-300, any comments on:
 
LT1364, LM6172, TLE2142, AD826, OPA627? 
 

 

[12Bass]

IC extraction tool?
 
Straighten them very carefully... and don't over do it.  If the pins are close, they'll straighten themselves next time they are pushed into a socket.
 
LM6172 is fast and might be unstable. From what I recall it was fairly "clear" sounding. The TLE series may be a bit better than the old TLO7X parts, but isn't as good as the better modern op amps, IMO. No experience with the others. Might try OPA827, AD797, AD825... depends on your taste.