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Old 21st September 2004, 05:23 PM   #21
raindog is offline raindog  Romania
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my personal favorite is TL074 ( j-fet input, 13v/us slew-rate, wide supply range, very LOW noise ) ; i just replaced an LM 124 in a graphic EQ with a TL074 and it made a huge defference.
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Old 24th October 2006, 10:31 PM   #22
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Default best opamp

I have no real "best opamp" but will relate the following;
I have an Arcam Alpha 5 cd player with some of the usual mods, NOS, recaps and diodes. The original opamps are a op27 and 5534 per channel. I have tried to clean up the PS feedlines as best I can with a few beads and inductors.

I just replaced the op27 with an AD797. I put in sockets also. What I can say is the sound stage is wider and much more 3d. The mids for some reason have warmed, while retaining the nice highs. It also seperated the instruments/vocals, you hear each singer as an individual. I also have some slight fuss that accompanies the signal and am now trying to sort that out. But the AD797 will stay. The op27 has low noise with a 2.8v/us slew rate. I think that while this is supposed to be fast enough, the 20v/us quieter ad797 is a better choice for this player.
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Old 24th October 2006, 10:45 PM   #23
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Oh geesh, I forgot about this thread

Quote:
Originally posted by Circlotron


Why would a TL074 not be as good as a TL072?
Are all four sections of a TL074 equally bad?
Is one half of a TL072 better than the other?

No silly, it's just I usually need one or two sections at a time. Too many past circuits I made, like bias servo's, use 1 section of a 324 and three go unused.
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Old 24th October 2006, 10:56 PM   #24
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Have you guys tried the new National LM 4562 ????

A lot of the guys over in the CD63 thread (longest non spamm thread there is lol) are raving over this 8pin dil, superb sound over all the other op amps that a lot of them have tried. It should be available soon as we have samples, it certainly sounds damn good in the cd63 ki player.

Dennis
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Old 26th October 2006, 12:27 AM   #25
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My current favorites are OPA2132 and OPA2134, but a few years ago, I used a lot of the motorolla 34082's. They were sold as video amps, but man to they sound good.


Sheldon
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Old 19th December 2006, 09:01 AM   #26
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Default Tried LM4562 - OPA627 still wins for me

I tried LM4562 smd version for a couple days in my DAC. The OPA627BP is by far better for my taste.

Mind you I was running it at +/- 18 volts. The supply caps and bypass caps were fully broken in. To me it was a very fair test.

I was using them as a buffer after a passive I/V stage in a NOS NF USB TDA1543 DAC.

The OPA627 really shines in this arrangement. It makes the music have a golden glow vs. the very clear by sterile sound of LM4562.

Just my 2 cents.

I also tried the new OPA211 and it didn't have any good qualities.

Cheers,
Brent
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Old 20th December 2006, 12:50 AM   #27
Ryssen is offline Ryssen  Sweden
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My best so far..
AD847 very detailed!
LT1468 Smother
AD8610....
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Regards Åke
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Old 20th December 2006, 11:42 AM   #28
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When your running the LM4562's try configuring some Blackgates right across the supply pins of the opamps, say 22uF with suitable voltage for the supplies.

I havnt tried the other opamps yet, still looking for some suitable burrbrowns for my CD63ki.

We have found that not all people have the same results, often because of either what follows the op amp, or precedes it such as the pre amp. I think as anything its finding the right balance and synergy in your system.

Just for consideration tho, over in the CD63 mods thread, we all gave the LM4562 top marks in the CD63, it performed well and is easy for most of the guys to fit also, removeing the HDAM and other clutter after it really brings it out.

If anyone has a suitable set of burr browns, or burr browns on brown dogs goin cheap for the Marrantz CD63, let me know.

Dennis
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Old 21st December 2006, 05:40 AM   #29
max29 is offline max29  Netherlands
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Take the 627 BP is it is affordable ... tried all but this one could not be beaten...
Tried in a low cost marantz c. d. player did not show all his qualities.
So what components are around and other details...current a.o. are supporting the opa is my main guideline.
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Old 21st December 2006, 11:07 AM   #30
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What is the cost of the 627 BP ?

Farnell lists the 627 i think for around £16 uk currency.

When implementing the op amp, you really need to consider its supply rails, The power supply is crucial to the op amp, fitting some local smoothing at the op amp pins helps, but a good supply source is essential to get the best from the op amp. If the DC supply is poor the results from the op amp will also be poor, however, the cheaper opamp may have coped with the poor supply. Experiment !

In the CD63 range of units the cheap op amp (2114) is helped by the HDAM circuit, effectivly a buffer. This for example holds back the quality of the audio. So if you fit a op amp you do need to consider the available power supply, the output path, and then the interconnects start to affect things in the case of a cd player, cant comment on the pre amp situation.
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