| m60gpmg |
In my Denon cdp there is an opamp, a nec 4570c, can I replace it with one best? :confused:
with this change I can improve the quality of the sound?
If the answer is yes, which do you recommend me?
i have alredy damped the case with a big improvement of the bass and a greater clarity of the middle and high ;)
Best regards,
m60gpmg |
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| Sparhawk |
| I replaced two 4570's in my Yamaha with four BB OPA627's. This is not easy to do, replacing a dual opamp with two singles. But the OPA627 seems to be the best, so I thought it was worth the trouble. I also added a Kwak Clock, and separate power supplies for the clock and the opamps. I have some pictures around somewhere... I'll post them if I can find them. |
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| m60gpmg |
| quote: | | This is not easy to do, replacing a dual opamp with two singles |
In fact I would prefer a simpler solution | quote: | | But the OPA627 seems to be the best |
Another good opamp that is not single on the contrary double does exist? (since I would prefer a simple assemblage)
Best regards,
m60gpmg |
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| peranders |
| If 4570 is a dual opamp maybe OPA2134 may fit? Anybody who has data over 4570? |
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| Wombat |
NEC 4570
Dual OP amp
4,5 nV
7V/µs
15MHz |
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| Sparhawk |
| quote: | Originally posted by m60gpmg
In fact I would prefer a simpler solution
Another good opamp that is not single on the contrary double does exist? (since I would prefer a simple assemblage)
Best regards,
m60gpmg |
Maybe an OPA2604? Probably the next best thing to a pair of 627's. |
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| peranders |
| quote: | Originally posted by Sparhawk
Maybe an OPA2604? Probably the next best thing to a pair of 627's. |
OPA2134 has slightly better data than OPA2604 but how much does it mean? |
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| Sparhawk |
| quote: | Originally posted by peranders
OPA2134 has slightly better data than OPA2604 but how much does it mean? |
I haven't compared them myself, but others seem to think that the 2604 sounds better than the 2134. |
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| Nicke |
| quote: | Originally posted by m60gpmg
In my Denon cdp there is an opamp, a nec 4570c, can I replace it with one best? :confused:
with this change I can improve the quality of the sound?
If the answer is yes, which do you recommend me?
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If it is a multibit DAC(I think Denon often have multibit DAC´s) I can recommend Jocko´s circuit.
Found here:Jocko´s I-V stage
I use a slightly modified version followed by a simple JFET follower.
Try it,you will not be disappointed ;)
Nicke |
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| Cobra2 |
I have a Nakamichi CD-4, with a 9(!)pin, single in-line NJM 5532 S,
-please help me with a data-sheet / pin-config for this!
Arne K |
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| Tube_Dude |
Hi Snake...:cool:
The pin function of the NJR5532 of 9 pins are
1--V+ (internaly conectd to 9)
2--A output
3--A - input
4--A + input
5--V -
6--B + input
7--B - input
8--B output
9--V+ (conct. to 1)
Regards
Jorge Santos |
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| Wombat |
@ m60gpmg
Here we go again!
As you can see none of us can give a unique advice
But for sure it depends on the design your CD-Player delivers
and how therefore an OP amp behaves in there.
All i can advice you is to make some tests on your own.
This NEC4570c is relative slow against the so called good ones. I bet
there will be a better one for you.
You have only one IC to swap, so it won´t hurt to buy 3 or 4 OPs and an
IC-Socket to start your own tests.
I would recommend to buy a cheap NE5532, a philips one when its possible.
One from the Brownies OPA2604 or OPA2134.
An OP275, one of the circuits many like a lot.
And finally a really fast settling one like the AD826 or LM6172.
None of them is bad sounding. There can only be some problems with the really
fast ones due to the board layout, like flickering in the TV next to it ;)
With this selection you can find one that fits and if you like it you can
enter the never ending story even more.
This way i found my favourites. |
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| m60gpmg |
| quote: | With this selection you can find one that fits and if you like it you can enter the never ending story even more.
This way i found my favourites. |
thanks of the suggestion I will do as you say
Thanks to everybody!
Best regards,
m60gpmg |
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| fedde |
| quote: | Originally posted by jean-paul
Finally I found a datasheet of C4570. |
You should have asked me... ;)
Fedde |
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| jean-paul |
Hi Fedde, it was Per-Anders that asked for it.
I still dream of a free datasheet-database on the web. Makes life easier for all of us when the companies delete theirs when you need them. |
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| fedde |
whoops, sorry not free... :-(
There is a free one though, I'll try to find the link again...
Fedde |
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| Jesús Puerto |
I did the same modification in Luxman CD
I changed it for one OPA2134 the change was better, only carefull becouse is neccesary that you respected the pin out,
also you need to make a little PCB to adapter the differents package outline,so
you can see an example in the www.lcaudio.com,
I have the datashett NJM5532 and I´ll sent you in PDF format at your email.
Jesús Puerto |
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| Fin |
Hi all
My CDP has a NJM5532 opamp in the output stage. I am interested in changing this for something better.
I know that opamps like OPA2134 and OPA2604 are drop in replacements physically, however, are any changes to the circuit/surrounding components required or advised?
I am also interested in Sparhawk's comments about replacing a dual opamp with two single opamps.
Are the Brown Dog adaptors used for this any good?
Do they introduce additional problems by moving the opamps further away from the PCB/groundplane?
Is there another/better way to do this? |
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| Calimero |
I swapped my opa2604 for those chips. Because the are only available in SMD-package you need browndog adapter boards.
I find the AD's have a much richer mid and high frequency, than the OPA. Furthermore the bass is very fast and I think due to its speed the sound-image has more depth.
Using this opamp and letting it perform requires special consideration for its V+ and V- as well as the grounding. I use 1nf prop caps from V+ to gnd and V- to gnd.
The max voltage according to teh datasheet is 13V, however I use them at 16V without any problems.
Henk |
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| Gordon McGregor |
Yeah, AD8066 or AD8620 are a good choice, but I've heard from a lot of people that they may be used <+/-12V power supply ... after that it could be a non-predictable result. In one situation they work fine, and in another one - produce more distortions.
Level of mid and high frequencies depends of the used DACs as well, I have more then enough of them in the DF1706->PCM1704-OPA627->OPA2134-OPA2134->OPA2134 audio signal path (all OPA, as you can see).
I didn't notice any difference in the level of highs and mids between OPA627 and AD843K, the first one was just a bit "softer" and "warmer", I guess it is because of the lower level of amplified input voltage noise (4.5 vs 19) as the level of THD in both op amps at 10kHz is almost the same (lower in OPA627 in between1 kHz and 10kHz) ...
I compared both for LFE signals as well, AK843 has more "punchy" bass, but I personally still prefer the "flowing" bass, produced by OPA627 ... I would not say that "punchy" is more accurate ... the booms are more or less the same, but you cannot hear that much in between them in comparison with OPA627 ...
And I don't like OPA2604 at all :) |
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| Jeff Wong |
In the past, whenever I've replaced a 072, 4558, 4570, or 5532 in a DAC, CD Player, or Phono Stage, with something like a 2132P, the results have always been positive; the music sounds less sluggish, less murky, and comes across with better pitch definition and articulation in the notes. Results may vary with implementation in design (which may be true of the former chips as well), but, I've found the 2604 sounds a bit harsh when compared to the 2132. Try different ones and see what sounds best to you.
My present DAC had many key components changed, and the 132PAs were changed to 627BBs. The results were impressive enough that I'm considering trying out two 627s for every 2132 I have in other components. But, because the entire analogue circuit was reworked, I cannot attribute all the benefits to the chips... but, it'll still be fun to try in my other components when I have time. |
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