[raoultrifan]

O can only suggest authorised dealers (check NJM's webpage). Perhaps Profusion, Mouser, Digikey could be the chosen one for purchasing MUSES opamps.

You could probably replace 5532 with something similar from NJM/JRC or ST (https://www.njr.com/semicon/PDF/NJM2114_E.pdf or even http://www.njr.com/semicon/PDF/NJM5532C_E.pdf).

 

[raoultrifan]

I believe you're having http://www.ti.com/lit/ds/symlink/ne5532.pdf.

A cheap upgrade could be http://www.njr.com/semicon/products/NJM5532C.html or https://www.njr.com/semicon/PDF/NJM2114_E.pdf, but also similar opamps from ST should do, just need to compare the specs (usually noise, but sometimes speed/MHz could help).

L.E.: Sorry for double-post, but I was unable to see my post after clicking the Post Reply button.

 

[olymind1]

LM4562 though clear and detailed is very "clinical" and in my experience a bit susceptible to power supply noise making it "metallic" sounding - as mentioned earlier in this thread you can do wonders with it sometimes bridging the rails with a 10uf aluminium electrolytic capacitor like an Elna Silmic II or Nichicon FG or KZ - though potentially that is trading accuracy for a subjectively more pleasing sound. That likely depends a bit at what stage in the pipeline it is used and how.

How many volts does it have to be? 16 or 35 ?

These sockets are usable for mounting? https://www.ebay.com/itm/7p-8-PIN-G...hash=item5ae2354103:m:m2tDkkrRS2SYwQfU4BAvyuQ ?

I'm actually quite a big fan of the OPA2228 over the 2134 but its only stable at higher gains so would need intimate knowledge of the circuit it was going into and quite fussy about the capacitors around it i.e. if there are ones used to limit bandwidth in the feedback loop, etc. and so on to sound good - a lot of people end up with a "grungy" sound because it can't just be dropped into the circuit they are using.

That i don't have.

LME49990MA, besides that is single and needs very good quality PCB to adapters, it could oscillate with ease, so depending on how it's built your Auzentech could be needed additional decoupling caps (fast multilayer 0.01-0.1uF + 1uF tantalum should probably do).

So if i understand correctly do high bandwidth gain op amps need more attention / more stabilizer components when placed into medium / low GBP designs, or can oscillate? Then same thing can be said to AD787BRZ too. So it is probably safer or rather it's simpler to search for a low/medium GBP opamps.

If i decide to buy the 49990s then exactly what kind of additional components do i need to buy for them so they can be stable?

 

[Rroff]

How many volts does it have to be? 16 or 35 ?

These sockets are usable for mounting? https://www.ebay.com/itm/7p-8-PIN-G...hash=item5ae2354103:m:m2tDkkrRS2SYwQfU4BAvyuQ ?

Voltage will depend on the device - typically a PC soundcard has 12V to play with so 16V is likely fine but you never know if they are using something like a charge pump or other DC-DC conversion to like +/- 12V rails, etc. some claim 35V capacitors have the best "linearity" but I've no idea if there is any truth to that - the ones I use most are 35V, 63V and 100V.

 

[DR650SE]

Static electricity killed my 6S.MKII OP AMP

I was listening to my AK100/UHA. 6S.MKII with Westone W40s while folding laundry. Picked up a towel, and boom, get shocked in my ear through my Westone W40!!

Then the left earbud stops producing sound. I panic as nothing in this rig is all that cheap to replace and I hate change. I try the headphones in my phone they work. Whew, one bullet dodged. Next I try them straight in the AK100. Whew another bullet dodged. Now I hook my phone to the 6S.MKII. No Dice, one ear out. I remember i got a few OP Amps and maybe, just maybe it's the OP AMP and nothing on the board. I swap the OPA 627AP with something random. Success!

So long story short, no UHA.6S MKII near static!! No more for laundry and that rig. Going solo AK100 for laundry.

Hears what I swapped them out with. It's one OP Amp I had on hand. Truthfully, I don't know if I can ever even tell the sound difference between OP amps, i'm not sure my ears are that good Anyhow, any opinions on the new OP Amp vs old OPA 627AP ?

 

[leeperry]

if you got that 627 for cheap from China then it was fake to begin with ^^

 

[DR650SE]

I believe it came from Leckerton Audio when the previous owner owned the amp. It's one of the sets that came with the amp when I bought it used.

However I coul be wrong since it came with the amp to me. Who knows where it came from. Doubtful I could tell any difference between real and fake either way.

 

[imran27]

So in my XD-05 I have tried following opamps:
- OPA1612
- OPA1602
- OPA1652
- LME49720
- Burson V5i-D

Of all these, LME49720 and OPA1652 are my favourites. LME49720 is just amazing, but compared to OPA1652 it has a laid back recessed mid-range, soundstage isn't as immersive and forward. Overall sound of LME49720 is somewhat lean as in lean and quick. Very detailed and transparent though and sounds very very real. But the soundstage presentation is more laid back like as if you're standing on the stage with instruments towards left, right and behind kinda like you are a performer/singer. OPA1652 gives you a more spectator kind of soundstage presentation. Everything seems to come from forward and with adequate body and thickness. It is still detailed but not at the level of LME49720.

For me, I prefer LME49720 for everything except videos and gaming. For videos, gaming or generally anything demanding a forward presentation I go to OPA1652.

In a couple of weeks I will also be receiving and testing these:
- OPA1642
- OPA1692 (In Preview, more than a month of lead time)
- OPA2140
- OPA2189 (In Preview, single version is Active)
- OPA2227
- ADA4610-2

And other suggestions you people might have

 

[rikk009]

So in my XD-05 I have tried following opamps:
- OPA1612
- OPA1602
- OPA1652
- LME49720
- Burson V5i-D

Of all these, LME49720 and OPA1652 are my favourites. LME49720 is just amazing, but compared to OPA1652 it has a laid back recessed mid-range, soundstage isn't as immersive and forward. Overall sound of LME49720 is somewhat lean as in lean and quick. Very detailed and transparent though and sounds very very real. But the soundstage presentation is more laid back like as if you're standing on the stage with instruments towards left, right and behind kinda like you are a performer/singer. OPA1652 gives you a more spectator kind of soundstage presentation. Everything seems to come from forward and with adequate body and thickness. It is still detailed but not at the level of LME49720.

For me, I prefer LME49720 for everything except videos and gaming. For videos, gaming or generally anything demanding a forward presentation I go to OPA1652.

In a couple of weeks I will also be receiving and testing these:
- OPA1642
- OPA1692 (In Preview, more than a month of lead time)
- OPA2140
- OPA2189 (In Preview, single version is Active)
- OPA2227
- ADA4610-2

And other suggestions you people might have

What would you say about the Burson?

 

[imran27]

What would you say about the Burson?

The V5i-D is pretty good all rounder. The highlight of that opamp is the soundstage, pretty expansive and imaging also is top notch. Detail retrieval is good enough. Bass and treble extensions are just about present ie you can't call it deep but not shallow either, same goes for treble.

The soundstage render/presentation is like as if the playback is happening in front of you in a closed well sealed studio. There is a lack of airiness though.

Everything sounds natural. But this natural is different from the realistic natural rendering of LME49720. Instruments in a studio sound slightly different than in an opera hall. V5i-D produces that studio'ish natural timbre whereas LME49720 produces the opera hall/open field kind of timbre/feel.

Basically V5i-D I feel is like a technically superior version of OPA1652 (details, clarity, soundstage characteristics).

 

[raoultrifan]

What would you say about the Burson?

There's also an entire thread about BURSON opamps, in case you might be interested I could share some thoughts too:
https://www.head-fi.org/threads/bur...ssion-and-reviews.854912/page-9#post-13830420
https://www.head-fi.org/threads/bur...sion-and-reviews.854912/page-10#post-13970143

Personally I'm thrilled about the SS V6 Classic.

 

[rikk009]

There's also an entire thread about BURSON opamps, in case you might be interested I could share some thoughts too:
https://www.head-fi.org/threads/bur...ssion-and-reviews.854912/page-9#post-13830420
https://www.head-fi.org/threads/bur...sion-and-reviews.854912/page-10#post-13970143

Personally I'm thrilled about the SS V6 Classic.

I know, I was just asking his preference. Thanks.

 

[Rroff]

In a couple of weeks I will also be receiving and testing these:
- OPA1642
- OPA1692 (In Preview, more than a month of lead time)
- OPA2140
- OPA2189 (In Preview, single version is Active)
- OPA2227
- ADA4610-2

And other suggestions you people might have

2140 in my testing had a slightly "off" colouration to the sound for want of a better way to put it - though I did have some issues with my amp due to the number of op amps I'd swapped out had weakened a connection by the time I got to the 2140. I found it very similar to the AD8066 in that it seems to preserve directionality down to lower frequencies giving a distinctive bass generally quite a dark sound but I had some issues in the treble (occasionally heard some "mushiness") with it which I've not gone back to retest to see if it was due to the connection issue. Think I need to clear a weekend build another basic amp without any of the frills of the amps I have in use now and retest some of these op amps.

I quite like the 2227 but IMO the 2228 is better if you can make it work.

 

[DRKreiger]

I am curios of peoples experiences with the LME49720NA. I am about to replace the JRC4580's in my HT Claro Halo Sound card.

Has anyone proven the severity of the oscillation issue with out decoupling capacitors present?

 

[imran27]

I am curios of peoples experiences with the LME49720NA. I am about to replace the JRC4580's in my HT Claro Halo Sound card.

Has anyone proven the severity of the oscillation issue with out decoupling capacitors present?

I love it.

It is pretty transparent and neutral. Overall it's a very lean sounding opamp best suited for reference and analytical listening. It is very accurate in it's reproduction of instruments and the imaging is pretty darn precise. It lacks soundstage though, not very good at it and what it has is also quite laid back.

Whatever opamp I use is only for a short stint because I keep coming back to LME49720.