The Opamp thread
Sep 25, 2020 at 5:42 AM Post #6,976 of 7,188

leeperry

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AD797 and OPA627 cannot be rolled blindly, they need a specific circuit built for them. They'll oscillate and/or sound way colored.

OPA828 is the newest 627, cheap too coz 627's on marketplaces are 99.999999% fake and genuine 627BP's cost a bundle.
 
Sep 25, 2020 at 6:03 AM Post #6,977 of 7,188

seamon

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AD797 and OPA627 cannot be rolled blindly, they need a specific circuit built for them. They'll oscillate and/or sound way colored.

OPA828 is the newest 627, cheap too coz 627's on marketplaces are 99.999999% fake and genuine 627BP's cost a bundle.
Yes I knew that and rolling in the AD797ANZ was a gamble. However, the AD797ANZ sounds very good in my setup. So I suppose I won the gamble?
 
Sep 25, 2020 at 10:56 PM Post #6,980 of 7,188

seamon

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Nah it most likely oscillates in the Mhz range and will sound way colored to some extent.
Hello again!
So just for some reference, I am trying to change the opamps in 3 different stages - I/V stage for 9038 Pro(accepts 2xDual) + LPF stage(Accepts 1xDual or 2xSingle) + Amp stage(Accepts 4xSingle or 2xDual).

On the Amp stage, AD797 sounds extremely transparent. On the LPF stage, I think there might be some oscillations but it sounds better than anything else. On the I/V stage, it's unusable because of heavy oscillations.

I am thinking of trying out the OPA1622 now.
1) Do you think it's good for all stages(I/V, LPF and Amp)?
2) What's a good source to buy OPA1622 in Dip8 sockets?
 
Sep 29, 2020 at 5:12 AM Post #6,981 of 7,188

mhhd

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I haven't had any bad experience with Cirrus Logic DACs myself. The only DACs that I've really disliked are just those ESS DACs. Disgusting sound.
I still prefer BB, AKM, and ADI, which are still common. AKM sure is popular these days.
I had not tried PCM1795 until the Teac P90 and FiiO E18. Wow, what beautiful sound.

Also, forgot to recommend ADA4001 over ADA4004. 4001 is uber transparent, more than most opamps. Specified for mic preamps, and I can hear why it would rock hard in such, especially in recording gear.
Hello Max,
Coming back to this older post :) Were you ever able to compare ADA4001 to ADA4610? Or to one of the better OPAs? Could you describe the differences you experienced?
Thank you very much,
Martin
 
Sep 30, 2020 at 2:03 PM Post #6,982 of 7,188

seamon

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Tried the OPA1622. It's disappointing. AD797 is better in the amp gain stage. OPA1612 is better in the I/V and LPF stage.
 
Oct 1, 2020 at 11:48 AM Post #6,983 of 7,188

mhhd

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I run opa1656 in my modded HA21. It partially depends on your circuit and some doesn't make opamps sound drastically different.

I think 1656 is better than 1692 in my gear. OPA2210 is also a good chip if it works.
Hello,
Did OPA2210 not work porperly? I ask as OPA2210 was very noisy in my application. So maybe the opamp is sensitive...?
Thanks a lot :)
 
Oct 1, 2020 at 8:37 PM Post #6,985 of 7,188

madnanny1

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I've built a couple of Cmoys, so my knowledge of opamps is limited.
ksc75smile.gif
I've tried the OPA2132, OPA2227, and the TLE2072. I am only using 1 9V battery and the best one for me that I've tried so far is the TLE2072. I was thinking of trying a TLE2082. Are there any other opamps that will work with just a single 9V battery supply? I would like to try a couple more.
Hello out there i have an acmee mf01 and wonder if anyone has tried replacing opamp with a burson v5i,cant find any info on this on internet. Can anyone help me thanks
 
Oct 7, 2020 at 8:55 PM Post #6,986 of 7,188

redrol

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Hello out there i have an acmee mf01 and wonder if anyone has tried replacing opamp with a burson v5i,cant find any info on this on internet. Can anyone help me thanks

Hey bro, I did this and its awesome!!! I love it. Nice difference from the Muses02 that it has. Highly recommended!! Bit more microdetails imo, slightly less warm but VERY nice.
 
Oct 7, 2020 at 8:56 PM Post #6,987 of 7,188

redrol

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Peak opamp? Not sure
Sparkos SS2590 x2 w/ Xduoo 05+

IMG_20201007_182443.jpg

First impressions are of course amazing. No really, damn, damn damn. I doubt I'll be able to like anything after this thing. It's got ALL the attributes I love. Just everything.. out of words
 
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Oct 10, 2020 at 2:46 AM Post #6,988 of 7,188

madnanny1

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Hey bro, I did this and its awesome!!! I love it. Nice difference from the Muses02 that it has. Highly recommended!! Bit more microdetails imo, slightly less warm but VERY nice.
Hello thanks for your reply,have a burson on order.what.headphones do you use ? I have. Sennheiser px100 mk 1 and 2,he150 pro .tried sennheiser hd599,very disappointed with sound my px100 sounded better,sent them back.also have monk and soundmagic e10 plus auglamour rx1
 
Oct 12, 2020 at 7:31 PM Post #6,990 of 7,188

Merlin-PT

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Today I decided to open the lid of some AliExpress opamps with a pair of pliers.
In 10xOPA627 SOP8 (bought used at 0.97eur each), I opened the 3 burned ones and was lucky. They are genuine.
There's no more stock so I couldn't buy more.

IMG_20201012_205602.jpg
 
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