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-   -   opamp substitution ----> Which one? (http://www.diyaudio.com/forums/digital-source/9612-opamp-substitution-one.html)

m60gpmg 8th January 2003 12:33 PM

opamp substitution ----> Which one?
 
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

Sparhawk 8th January 2003 01:49 PM

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.

m60gpmg 8th January 2003 03:29 PM

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

peranders 8th January 2003 03:41 PM

If 4570 is a dual opamp maybe OPA2134 may fit? Anybody who has data over 4570?

Wombat 8th January 2003 03:43 PM

NEC 4570

Dual OP amp

4,5 nV
7V/µs
15MHz

Sparhawk 8th January 2003 04:26 PM

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.

peranders 8th January 2003 05:15 PM

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?

Sparhawk 8th January 2003 05:18 PM

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.

Nicke 8th January 2003 09:10 PM

Re: opamp substitution ----> Which one?
 
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?


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

Cobra2 8th January 2003 09:48 PM

more op-amp subst...
 
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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