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Old 12th October 2003, 01:44 PM   #1
Salas is offline Salas  Greece
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Default JRC or NJM 4580D question

Hello all,

I have this Project audio mm/mc preamp that uses JRC 4580D opamps. Are they pin compatible with NE5532, OPA 2134 etc? I suspect so but could not find a spec sheet somewhere. I want to upgrade its sound. Which well known opamp pin out the 4580D follows?
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Old 12th October 2003, 04:29 PM   #2
Netlist is offline Netlist  Belgium
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Hi salas
Here's a datasheet from the 4580D.
http://www.njr.co.jp/pdf/ae/ae04056.pdf
here for the NE5532:
http://www.semiconductors.philips.co...A_SA5532_3.pdf
and here for the OPA2134:
http://www-s.ti.com/sc/ds/opa2134.pdf

I don't know for sure but I recall Per-Anders saying somewhere
that the AD8620 is a very good opamp. (Watch the Max voltage!!)
Oh, and there's plenty of info on this site about it the 8620.
Here's the datasheet as well:
http://www.analog.com/UploadedFiles/...D8610_20_c.pdf
www.google.com is also a great search engine.
Be creative, try searching for "NE5532 datasheet" or similar
terms. It's a great source of info.

Now it's up to you to have a look at the specs

/Hugo
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Old 12th October 2003, 04:44 PM   #3
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Standard dual opamp pinout.

Eric.
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Old 12th October 2003, 04:45 PM   #4
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Quote:
Originally posted by Netlist
I don't know for sure but I recall Per-Anders saying somewhere
that the AD8620 is a very good opamp. (Watch the Max voltage!!)
Oh, and there's plenty of info on this site about it the 8620.
Here's the datasheet as well:
http://www.analog.com/UploadedFiles/...D8610_20_c.pdf
I'm not the only one who really likes the AD8610/20.

AD8610/20 is slightly better than OPA727/637 on almost every parameter except noise. I'm really impressed by the extremely low offset voltage.
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Old 12th October 2003, 04:49 PM   #5
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Default Re: JRC or NJM 4580D question

[QUOTE]Originally posted by salas
[B]Hello all,

I have this Project audio mm/mc preamp that uses JRC 4580D opamps. Are they pin compatible with NE5532, OPA 2134 etc? ------------------------------------------
Yes; they don't sound very nice although the pro world (Behringer etc) seems to think it's great. When replacing with 86xx be careful about the maximum rail voltages.
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Old 12th October 2003, 05:56 PM   #6
Salas is offline Salas  Greece
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Default Cheers

Thanx guys, you really have been xtremely helpful.
I used google but to no avail (got only japanese references). Thats why I resorted here...proved our forum is tops.
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Old 12th October 2003, 08:32 PM   #7
Salas is offline Salas  Greece
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Default as for sound

Ages ago I have runned comparisons in a fixed gain stage (x10).
5532s where so crap....2604s where good but rather crude....627 was very impressive but tiresome and hi-fi, short of contrived in the long run...637 was better but could not use it as a buffer.
LT 1028 was fast and clear but had metallic midbass....
Made one out of 12AU7 valve....well it stomped allover any opamp!
But I cant be putting valves anywere all the time...
OPA 2134 looked promissing and I replaced OPA 2604 in a cdp...it sounded more grainy...it was a step back from 2604!
Maybe it sounds better in other applications? AD never tried...heard it in a friends line stage (825) it suffered bass impact although it was more natural than BBs more fluent.
What would you say for trying out 2134 in the mm/mc I wanna upgrade now? cost must stay low and a drop in replacement must be.
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Old 12th October 2003, 08:50 PM   #8
Salas is offline Salas  Greece
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Default forgot to mention bias

when I was changing the V+,V- voltage I got significant sonic differences with all op amps too. Most of them proved happier near their upper limit. 627,637 needed about 17V to sound best. LT1028 also. That is why I think I may have been unfair when substituted 2134 for 2604 in a fixed cdp circuit. Other parametres come in play too...decoupling, capacitive loads etc.
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Old 16th October 2003, 11:10 PM   #9
markp is offline markp  United States
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That JRC opamp is very, very cheap so it is used everywhere. Because of this the world is a little worse off! Almost any newer opamp will sound better but make sure you use local bypass caps on the supply rails and think about beefing up the whole supply.
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Old 27th October 2003, 07:24 PM   #10
macboy is offline macboy  Canada
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Any opinions on the Texas Instruments equivalent, part number RC4580? The specs are the same, but I would think that the actual construction is different, and that the sound will be different too. I just replaced a bunch of Mitsubishi M5218's with the TI RC4580 in a receiver that I am repairing, and I am so far pleased with the result. The noise floor is definitely lower. The specs say that the TI RC4580 should sound better; anyone with better ears than I have ever listened to it specifically and have an opinion? I am sure that TI produced this opamp in order to gain some market from all those that like to use the NJM4580/JRC4580; do you think that TI did a better job on their version than the Japanese did on their own?
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