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The Opamp thread - Page 271

post #4051 of 4749

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.

post #4052 of 4749
Quote:
Originally Posted by Mad Max View Post

OPA827 rules.

 

IMG_0097.JPG

 

I think that it could still benefit from a little more bypassing.  =p

 

 

LME49990 is great, too.

I'm surprised it doesn't have its own self powered power conditioner

post #4053 of 4749
Quote:
Originally Posted by ecohifi View Post

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.

 

That's the opposite of my observations.

 

That many caps is overkill, just a ceramic and two 0.1uF MKP1837 are enough, lol.

post #4054 of 4749
Quote:
Originally Posted by ecohifi View Post

[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.

 

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!) :-)
post #4055 of 4749
Quote:
Originally Posted by zilch0md View Post

 

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!) :-)

 

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....

post #4056 of 4749
Given that both you and qusp like the 49990, I'm sure I'll be happy with it. I can't afford to do any wild experiments. I'm content to follow in the footsteps of your experience. :-) Mike
post #4057 of 4749
Quote:
Originally Posted by SpudHarris View Post

 

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....

 

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.

post #4058 of 4749

Hi Nigel,

how's the sound with ADA4637-1 & ADA4627-1?compare with LME49990?

post #4059 of 4749

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......

post #4060 of 4749

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.

post #4061 of 4749

Hi genclaymore!

 

Quote:
Originally Posted by genclaymore View Post

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.

 

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.

 

Mike

post #4062 of 4749
Originally Posted by genclaymore View Post

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.

 

http://www.ebay.com/itm/1PCS-Dual-Mono-LME49990MA-replace-OPA2604-NE5532-TL072-/320863640326 (seller: hifiic)

 

Edit:  Noticed Mike posted another seller above.


Edited by kiteki - 7/3/12 at 5:10pm
post #4063 of 4749

Hi kiteki,

 

Quote:
Originally Posted by kiteki View Post

 

http://www.ebay.com/itm/1PCS-Dual-Mono-LME49990MA-replace-OPA2604-NE5532-TL072-/320863640326 (seller: hifiic)

 

Edit:  Noticed Mike posted another seller above.

 

 

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

post #4064 of 4749

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.

post #4065 of 4749
Quote:
Originally Posted by zilch0md View Post

 

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!) :-)

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!


Edited by ecohifi - 7/3/12 at 6:56pm
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