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Old 16th August 2010, 12:47 PM   #1
liquias is offline liquias  Israel
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Default Op amp swapping

Hi,
I intend to mod two very old CD players hoping to get nicer results out of them:
1) NAD5425 (NE5532)
2) Sherwood CD1000C (jrc4560)

I have read about Op amp swapping by people the are modding their CD players. I have read that the lm4562 gives wonderful results.

However, I was wondering is it just out with the old, in with the new (of course considering that both amps have the same pinout) or does it also require some recalculating and redesigning with the new amp, and if so, how do i go about it ?
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Old 17th August 2010, 06:38 AM   #2
Mooly is online now Mooly  United Kingdom
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It's a straight swap, no other components are altered.

Also consider trying the OPA2604. Perhaps fit sockets to compare.
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Old 18th August 2010, 06:27 AM   #3
liquias is offline liquias  Israel
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Default OPA2604ap

Thanks Mooly,
I have bought a batch of 10 OPA2604ap on Ebay just for the comparison.
I will fit sockets and compare as soon as I get both the 4562 and the 2604.

BTW, do you know what the 'AP' suffix mean, is the same as OPA2604? (I couldn't find any reference for the suffix in the datasheet...)

Again, thanks for everything.

Liquias.
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Old 18th August 2010, 06:34 AM   #4
wwenze is offline wwenze  Singapore
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Some of the Burr-Brown chips come in two grades, e.g. OPA627AP and OPA627BP, BP slightly better specs that's all, it's still the same thing but different grade.

Then AP vs AU, P is DIP, U is SOIC.
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Old 18th August 2010, 06:44 AM   #5
Mooly is online now Mooly  United Kingdom
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My data sheets list AP version only. Not a problem... as wwenze says, sometimes devices are available in higher grades (Military, higher temperature range, ceramic packaging etc).
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Old 18th August 2010, 12:57 PM   #6
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Liquias,
I have tried swapping different opamps with NAD5425, I found the factory NE5532 sounds better on this model. What is your like??
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Old 18th August 2010, 11:52 PM   #7
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That's ridiculous. I did swap directly 5532 with many and it is not such a great OpAmp. LM4562 was the best for me, OPA2604 was ok too (but not so good). There are some AD8599 OpAmps that I will try soon, just didn't have the time till now.
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Old 19th August 2010, 07:09 AM   #8
liquias is offline liquias  Israel
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Default Guys,

Thank you for the input and info.
I have ordered the LM4562 and the OPA2604, and I should receive it by mail in a matter of two weeks or so...
I plan on installing a socket into the print, so I can change between Op Amps and choose the one I like best. I'll be sure to update when I find which one I prefer.
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Old 19th August 2010, 07:13 AM   #9
liquias is offline liquias  Israel
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Default Btw

When choosing a socket is there a preferred kind of socket?

I know two kinds I can use (pictures attached).

On the one hand the gold plated seems of higher quality, but on the other hand the contacts on the regular one seem to be better.

Which socket is best? Will I hear the difference ?
Attached Images
File Type: jpg 8 pin gold plated.jpg (4.6 KB, 338 views)
File Type: jpg 8 Pin IC Socket.jpg (17.8 KB, 323 views)
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Old 19th August 2010, 07:26 AM   #10
Mooly is online now Mooly  United Kingdom
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The larger "flat pin" is perhaps better if you do a lot of swapping.
The round hole type "damage" the pins on the IC slightly, but are better if the device is to be left in.

What I would also suggest is careful soldering of a small 0.1uf cap directly onto the IC itself across the power pins. If you do it carefully and neatly it will not effect the way it fits in the socket. If you do this clean the pins of the IC with ISO and a cotton bud before fitting in the socket to remove flux etc.
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