opamp substitution ----> Which one?

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m60gpmg

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Joined 2002
#1
In my Denon cdp there is an opamp, a nec 4570c, can I replace it with one best? 😕
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
 
#2
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.
 
#9
m60gpmg said:
In my Denon cdp there is an opamp, a nec 4570c, can I replace it with one best? 😕
with this change I can improve the quality of the sound?
If the answer is yes, which do you recommend me?
Click to expand...

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
 
#12
@ 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.
 
#19
Cobra2

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
 
#20
Replacing opamps

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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