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The Opamp thread
Jul 2, 2012 at 4:24 PM Post #4,051 of 7,383
Sorry Mad Max,
 
is that shot for a Transformer scene???
ksc75smile.gif

 
Couldnt help myself.
 
The OPA 827 is a great chip but it seams to loose resolution in complex passages.  This is where I finf the 49720 so interesting compared to the 49990.  In the circuit I have the 49990 are thin and lifeless but the resolution is great.  When yoiu go back to the 49720 you realise the 49990 trick you in believing its a better chip.
 
Jul 2, 2012 at 4:27 PM Post #4,052 of 7,383
Quote:
mad max said:
OPA827 rules.
 

 
I think that it could still benefit from a little more bypassing.  =p
 
 
LME49990 is great, too.
Click to expand...

I'm surprised it doesn't have its own self powered power conditioner
 
Jul 2, 2012 at 4:38 PM Post #4,053 of 7,383
Quote:
ecohifi said:
Sorry Mad Max,
 
is that shot for a Transformer scene???
ksc75smile.gif

 
Couldnt help myself.
 
The OPA 827 is a great chip but it seams to loose resolution in complex passages.  This is where I finf the 49720 so interesting compared to the 49990.  In the circuit I have the 49990 are thin and lifeless but the resolution is great.  When yoiu go back to the 49720 you realise the 49990 trick you in believing its a better chip.
Click to expand...

 
That's the opposite of my observations.
 
That many caps is overkill, just a ceramic and two 0.1uF MKP1837 are enough, lol.
 
Jul 2, 2012 at 6:41 PM Post #4,054 of 7,383
ecohifi said:
[snip]
 
The OPA 827 is a great chip but it seams to loose resolution in complex passages.  This is where I finf the 49720 so interesting compared to the 49990.  In the circuit I have the 49990 are thin and lifeless but the resolution is great.  When yoiu go back to the 49720 you realise the 49990 trick you in believing its a better chip.
Click to expand...

 
My 4x 49990 singles haven't even arrived yet and now I'm being enticed to order some 49270s, too! I'm going to have to stop reading this thread. (Not!) :)
 
Jul 2, 2012 at 7:21 PM Post #4,055 of 7,383
Quote:
zilch0md said:
 
My 4x 49990 singles haven't even arrived yet and now I'm being enticed to order some 49270s, too! I'm going to have to stop reading this thread. (Not!) :)
Click to expand...

 
The 49720 has an initial Wow/Hi-fi factor which made me want to listen more. However, fatigue soon sets in and it becomes boring and metalic. don't lose any sleep over the 49720 and enjoy the 49990 which has transients to die for....
 
Jul 3, 2012 at 1:28 AM Post #4,057 of 7,383
Quote:
spudharris said:
 
The 49720 has an initial Wow/Hi-fi factor which made me want to listen more. However, fatigue soon sets in and it becomes boring and metalic. don't lose any sleep over the 49720 and enjoy the 49990 which has transients to die for....
Click to expand...

 
You have to add at least a 0.1uF ceramic across the power pins to get rid of the "rolled-up" treble that it often has when dumped randomly into any piece of equipment.  Its balance becomes very linear like my other opamp modules with psu bypass caps, yet it still retains a strangely, and unpleasantly, artificial sound.  More tolerable, at least.
 
Jul 3, 2012 at 5:35 PM Post #4,059 of 7,383
Well, the ADA4637 was a long time favourite of mine. I never really got the 4627 like some (MadMax), not that I didn't try, I used it over a period of time but just never fell in love with it. We are all different with different needs and preferences and that's why you should always take what others say with  this in mind. The LME49990 is not just a favourite of mine but many others so I guess majority rules in this instance. I believe it to be a better OpAmp than the 4637 because it is a more realistic sound. The 4637 sure is a lot of fun but again, it all depends on what floats your boat and that's why it's nice to be able to roll coz some nights I just want a musical unfatiguing evening and other nights I want emotion and realism.
 
I recently tried the THS4031 (single) and 4032 (dual) and have to say in my PB-2 and Fi-Quest they are very, very nice indeed. All this said, I have reflected on the time spent obsessing over the Holy Grail of OpAmps and realised that although fun at times it is no replacement for a properly implemented or optimised OpAmp and circuit.
 
Haha, bet you wish you never asked now
tongue.gif
......
 
Jul 3, 2012 at 7:54 PM Post #4,060 of 7,383
Look like they much be very good if alot of people like the LME49990s. Only reason i don't have them, as I can't solder to put them on adapters.
 
Jul 3, 2012 at 8:08 PM Post #4,061 of 7,383
Hi genclaymore!
 
Quote:
genclaymore said:
Look like they much be very good if alot of people like the LME49990s. Only reason i don't have them, as I can't solder to put them on adapters.
Click to expand...

 
I can't solder very well, either, but I ordered two pair of LME49990 singles, already soldered onto SOIC-to-DIP8 adapters, from an ebay seller named frugalphile.
 
Try this link:  http://www.ebay.com/itm/2x-LME49990-DIP8-ADAPTERS-/190679106821?pt=US_Amplifier_Parts_Components&hash=item2c655c4505#ht_968wt_1140
 
If that link doesn't work, try searching eBay for this item:   2x LME49990 DIP8 ADAPTERS
 
I haven't received them yet (ordered a couple of days ago), but he currently has 100% positive feedback from 501 transactions.
 
I read very positive things about his soldering skills here at Head-Fi.  Try searching Head-Fi for his ebay name:  frugalphile
 
I wish his store offered more ready-to-use op-amps and buffers on DIP8 adapters, but I'm happy for now that he offers the LME49990.
 
[size=medium]Mike[/size]
 
Jul 3, 2012 at 8:09 PM Post #4,062 of 7,383
Jul 3, 2012 at 8:30 PM Post #4,063 of 7,383
Hi kiteki,
 
Quote:
kiteki said:
 
http://www.ebay.com/itm/1PCS-Dual-Mono-LME49990MA-replace-OPA2604-NE5532-TL072-/320863640326 (seller: hifiic)
 
Edit:  Noticed Mike posted another seller above.
Click to expand...

 
 
That's a much better price for the pair of LME49990 "duals" than what I paid for the two pair of LMD49990 singles - ignoring that hifiic is in China vs. fruglphile being in Canada.  Either way, I suspect the shipping will take a while to reach the U.S. where glenclaymore and I both reside.
 
Do you suppose there is any SQ advantage to be had by running four singles in an iBasso PB2 vs. two of hifiic's "Dual to Mono" contraptions - since the "Dual to Mono" aren't really Duals but rather twinned Singles?
 
Mike
 
Jul 3, 2012 at 9:15 PM Post #4,064 of 7,383
Like this?
 

 
I'm not familiar with every last corner of the design but intuitively twin single mono (in my ebay link) at the top, versus 4 single mono in a row, should yield the exact same result.
 
In something like OPA111 versus OPA2111, two x of the former seems better, but I'm not sure if that's the case, if you seperate the stereo channels, what if there's a 1 nanosecond delay?  Just an example.
 
Jul 3, 2012 at 9:49 PM Post #4,065 of 7,383
Quote:
zilch0md said:
 
My 4x 49990 singles haven't even arrived yet and now I'm being enticed to order some 49270s, too! I'm going to have to stop reading this thread. (Not!) :)
Click to expand...

I havent tried the LME 49880 and 49860 but are willing to give them a go!!!!!!
tongue_smile.gif
   THe LME 49860 are higher supply voltage version of the LME 49720 and from what I have seen its also better!
 
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