Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

The best sounding audio integrated opamps
The best sounding audio integrated opamps
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 22nd September 2018, 03:47 PM   #2331
mondogenerator is offline mondogenerator  England
diyAudio Member
mondogenerator's Avatar
Join Date: Sep 2009
Location: Nuneaton, GB
Originally Posted by ChristianThomas View Post
The LF353 is not a bad op amp, IMHO, and that of a few others. It was used in the original Meridian 101 preamp and didn't seem to get in the way. There's a longstanding rumour - decades old - that it and the TLO71/2 are one and the the same. I quite like the TLO72 for its get up and go, and it would probably be my choice if I were to design a budget component that needed to be engaging.
I'm glad that others seem to think the LF353 is a reasonable budget audio op amp. The JFET input is what I think I like about it, on a similar way that the OPA541 etc were attractive a few years ago.

LM7171 is one I'd like to try, as is one part I forget the number...but it is something like 1A output Ft of 600kHz.

TLE2301 or NTE1854 !!! that's it, I think....

Heck I have LM759 here, if only I could find a composite Master OP AMP slow enough and quiet enough to build the composite!

I'm actually part way through a Self style Op amplifier for headphones, using multiple paralleled LM833 rather than NE5532, as they are some 20% cheaper, and performance seems, on paper, fairly close.
In a world full of self proclaimed experts, the humble are king

Last edited by mondogenerator; 22nd September 2018 at 04:02 PM.
  Reply With Quote
Old 22nd September 2018, 06:57 PM   #2332
scott wurcer is offline scott wurcer  United States
diyAudio Member
scott wurcer's Avatar
Join Date: Jan 2004
Location: Belmont MA
Originally Posted by ChristianThomas View Post
Do those simplified published circuits actually reflect the circuit inside?
In this case yes.
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
  Reply With Quote
Old 23rd September 2018, 08:42 AM   #2333
davidsrsb is offline davidsrsb  Malaysia
diyAudio Member
Join Date: Dec 2005
Location: Kuala Lumpur
The LF353 had a stronger output stage, very little down into 1k
The TL072 is for about 2k minimum
  Reply With Quote
Old 27th September 2018, 06:09 PM   #2334
audioman54 is offline audioman54  United States
diyAudio Member
audioman54's Avatar
Join Date: Jun 2008
Hi DIY Audio Group and Johnego,

I have been doing this "audio stuff" a very long time and worked closely with great analog circuit engineers like Bob Pease at National Semi. I will tell you the LME49713 is the best sounding opamp we ever created on the very special LME high voltage process that is gone now. We did extensive listening sessions comparing VFB and CFB opamps and for most applications we preferred the LME CFB's (LME49713HA) with the exception sometimes being for +/- DAC outputs where the identical +/- inputs on the VFB opamps present identical loads to the DAC's. The +/- inputs on a CFB opamp are different input circuits.

Anyway we designed the LME49713HA CFB opamps to exceed the AD811 specs and made some significant changes to optimize it for audio (rather than video) but the bandwidth is still very high (which is a good thing for a lot of reasons) and thus requires careful PC layout to prevent oscillations. The AD811 was based on the AD9610 metal can mil spec opamps and one of the best measuring and sounding opamps ever...also super expensive and impossible to find. I still have a few for personal projects.

We attempted to do our critical listening tests (after all the measurement tests) single and double blind but there is always room for error/disagreement in all listening results.

Just wanted everyone on this forum to think/try VFB and CFB (voltage feed back vs current feedback) opamps in their new designs. I mentioned the older AD811 ADI CFB parts because the last I heard the LME high voltage process was shut down by TI.

Best “Retired” Audio Regards Everyone,

  Reply With Quote
Old 27th September 2018, 06:17 PM   #2335
00940 is online now 00940  Belgium
diyAudio Member
00940's Avatar
Join Date: Sep 2003
Location: Liège
The LF351 was used in the Audiovalve RKV hybrid headphones amp. A very decent sounding amp (I had it in kit form).

The lme49713 was a perfect output stage for headphones. Too bad it got discontinued.
All that is excessive is insignificant. Talleyrand
  Reply With Quote
Old 28th September 2018, 06:56 AM   #2336
mercedese63 is offline mercedese63  United States
diyAudio Member
Join Date: Apr 2018
Originally Posted by johnego View Post
The AD746 is the dual version, thus it doesn't have the COMP pins.

I have different view on the buffer part. Many good sounding opamps have bad performance (THD) driving low impedance load. But if you like the character of an opamp, then you buffer it with random opamp that will change those character you like, it is possible that you will blame the buffer.

BTW, what are your favorite opamps? Do you like the 744?
Yes, I'm very aware that the AD746 is the dual version of the AD744 w/o the compensation pins.
I have probably at least of 100 pcs. of each so I've been well aware of the differences between the 2 op-amps for years now.

Most op-amps weren't designed to drive low impedance loads in the first place and I don't use them in applications where they're expected to do so.
I ONLY use op-amps for low-gain preamp applications so their output current is usually more than adequate for those applications.

If a certain noninverting op-amp circuit sounds one way without a buffer and then sounds obviously worse with the addition of some type of buffer after it, then yes it's only common sense that one "blames" the buffer for the reduced sound quality.
There's no buffer that's absolutely 100% transparent that I've come across.
Should you come across one, by all means let me know.
For driving headphones there are numerous discrete designs that will leave many op-amps(even with a buffer) designs in the dust when it comes to output current and sound quality.

As for op-amps that I like, yes I like the AD744/746 as well as the ole' AD711/712 from Scott.
The AD4627-1, AD4610-2 and AD8597/8599 are also some of my favorites.
In addition, in the right applications I have found that many of the JRC bipolar chips, that many people on here try to degrade and dismiss, can sound very good and most can be purchased for less than $1USD each.
As for the LM4562/LME49720/LME49860...they just don't "do it" for me in all the circuits I've tried them in over the years but there are many loyal followers here for those chips.

I won't be replying to anymore posts about op-amps in this thread since my opinions/views are just one of hundreds on this forum.

Good luck with your project & happy listening!
  Reply With Quote
Old 28th September 2018, 10:32 PM   #2337
phase is offline phase  United States
diyAudio Member
Join Date: Oct 2004
While I was working my way through trying different integrated op amps, I wound up liking the ad744, jrc2114, sometimes jrc5532 more often than any others. Also the Muse parts have a very nice detailed sound that wasn’t heard in any of the others, although at a higher price.

I kind of saw that my bank account was draining fast, ordering small quantities of parts, paying for shipping, while trading one sonic benefit for another between the myriad of parts. It was also starting to look like my childhood collection of Hotwheels, and nearly as fun. I decided to finally just go ahead and try some popular discrete parts and end the hemorrhaging. That was 4 years ago.

There should be an op amp section in public libraries!

Also, the ad744 was nicer with a bit of bias also.

Last edited by phase; 28th September 2018 at 10:37 PM.
  Reply With Quote
Old 19th October 2018, 10:37 AM   #2338
kees52 is offline kees52  Netherlands
diyAudio Member
Join Date: May 2009
Location: Sprang-capelle Holland.
Rare there chinese suppliers who can be trusted for this opamps?, because there are reprinted ones and difficult to check.

Maybe someone has good experience with a supplier.
  Reply With Quote
Old 25th December 2018, 05:46 PM   #2339
Dave Lillis is offline Dave Lillis
diyAudio Member
Join Date: Dec 2018
Hi everyone,

Long time lurker here, this thread is amazing, 234 pages spanning nearly 10 year, I dont have time to read it all, but have stumbled through a few pages of it.

Quick question, I have a NAD 1130 preamp , it's simple enough inside, but it still sounds great even though its over 30 years old, I'm going to recap it soon ( they must be degrading by now) and I see that it has 1 opamp, yes only 1, a NJM2043D a 8 pin 2 channel opamp, It's a 30 year old opamp, there must be even nicer sounding opamps out there by now I could put in there instead, any recommendations??

The opamp is fed by a RC filter network, the feedback loop contains the bass/treble RC filters and the output goes to a fet circuit which allows for the switching of the output between high and low.

It's an impressive sounding little preamp given its age, for those interested the phono stage is a discreet bipolar differential amplifier design with mc/mm selection and input capacitance selection, it feeds into the input selector which feeds into the opamp and filters, this goes to the low voltage outputs, there is a second discreet differential amplifier for the high voltage output (which I dont use).

The dc on the board is +23.5, and -21.5 volts.

Any easy to get opamp recommendations would be appreciated .

Thanks in advance

Last edited by Dave Lillis; 25th December 2018 at 05:53 PM.
  Reply With Quote
Old 25th December 2018, 07:01 PM   #2340
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
Mooly's Avatar
Join Date: Sep 2007
The best sounding audio integrated opamps
Is the opamp running directly off the voltages you mention, or is there further regulation on the board? Measure the voltage on pins 4 and 8 of the opamp to be sure.

If it is running on such a high voltage then your choice is limited.

If the voltage is -/+18 or lower then you have much choice and I would probably suggest the LM4562.

Another option (if feasible) would be to reduce the rails to -/+18.
  Reply With Quote


The best sounding audio integrated opampsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
The Best Sounding DUAL opamps mudihan The Lounge 376 1st January 2019 05:58 PM
-: Best audio OpAmps :- audioPT Parts 62 9th April 2013 12:44 PM
best sounding Tx for sub 10watt class A audio amp? mondogenerator Solid State 2 2nd October 2009 06:21 AM
Help the Idiot: Simple, Great-Sounding Integrated Amp Designs SRMcGee Tubes / Valves 7 15th September 2005 07:43 PM

New To Site? Need Help?

All times are GMT. The time now is 11:15 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio