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Upgrading opamp

Thinking of upgrading and tweak my amplifier Quad Opamp
From this:

STMICROELECTRONICS - TL074CN - OP AMP, QUAD JFET, DIP14
STMICROELECTRONICS,TL074CN,OP AMP, QUAD JFET, DIP14 Image is for illustrative purposes only.
Please refer to product description

Catalogue Page More Images


Manufacturer: STMICROELECTRONICS

Order Code: 9755934

Manufacturer Part No: TL074CN

RoHS : RoHS Compliant Yes
Description

* OP AMP, QUAD JFET, DIP14
* Amplifiers, No. of:4
* Op Amp Type:Low Noise, High Speed
* Gain, Bandwidth -3dB:3MHz
* Slew Rate:13
* Termination Type:Through Hole
* Case Style:DIP
* Temperature, Operating Range:0°C to +70°C
* Amplifier IC Type:JFET
* Bandwidth:3MHz
* Base Number:074
* Device Marking:TL074CN
* IC Generic Number:074
* Logic Function Number:74
* Operational Amplifier Features:Low Noise
* Pins, No. of:14
* Temp, Op. Max:70°C
* Temp, Op. Min:0°C
* Temperature Range, IC:Commercial
* Voltage, Input Offset Max:13mV
* Voltage, Supply +Nom:15V
* Voltage, Supply Max:36V
* Voltage, Supply Min:6V

to this :

NATIONAL SEMICONDUCTOR - LM837N - OP AMP, QUAD, DIP14, 837
NATIONAL SEMICONDUCTOR,LM837N,OP AMP, QUAD, DIP14, 837 Image is for illustrative purposes only.
Please refer to product description

Catalogue Page More Images


Manufacturer: NATIONAL SEMICONDUCTOR

Order Code: 9488391

Manufacturer Part No: LM837N

RoHS : RoHS Compliant Yes
Description

* OP AMP, QUAD, DIP14, 837
* Amplifiers, No. of:4
* Op Amp Type:Low Noise, High Speed
* Gain, Bandwidth -3dB:25MHz
* Slew Rate:10V/µs
* Termination Type:Through Hole
* Case Style:DIP
* Temperature, Operating Range:-40°C to +85°C
* Amplifier IC Type:Operational
* Bandwidth:25MHz
* Base Number:837
* IC Generic Number:837
* Logic Function Number:837
* Pins, No. of:14
* Temp, Op. Max:85°C
* Temp, Op. Min:-40°C
* Voltage, Input Offset Max:5mV
* Voltage, Supply +Nom:18V
* Voltage, Supply Max:36V
* Voltage, Supply Min:10V

or this :

NATIONAL SEMICONDUCTOR - LME49740NA - OP AMP, HIFI AUDIO, QUAD, MDIP14
NATIONAL SEMICONDUCTOR,LME49740NA,OP AMP, HIFI AUDIO, QUAD, MDIP14 Image is for illustrative purposes only.
Please refer to product description

Catalogue Page More Images


Manufacturer: NATIONAL SEMICONDUCTOR

Order Code: 1433169

Manufacturer Part No: LME49740NA

RoHS : RoHS Compliant Yes
Description

* OP AMP, HIFI AUDIO, QUAD, MDIP14
* Case Style:MDIP
* Temperature, Operating Range:-40°C to +85°C
* Amplifiers, No. of:4
* Bandwidth:55MHz
* Base Number:49740
* Pins, No. of:14
* Slew Rate:20V/µs
* Temp, Op. Max:85°C
* Temp, Op. Min:-40°C
* Termination Type:Through Hole
* Voltage, Input Offset Max:0.1mV
* Voltage, Supply +Nom:17V
* Voltage, Supply Max:17V
* Voltage, Supply Min:2.5V
* Gain, Bandwidth -3dB:55MHz
* Op Amp Type:Low Noise, Low Distortion

Hmmm.... will be experimenting. Stay tune folks.
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Comments

Anonymous said…
Burr Brown makes quad versions of their OPA134 and OPA132: they are the OPA4134 and OPA4132. These are both FET input opamps, whereas the 2058/4558 is a bipolar input. They are also much faster than the 4558. Therefore they are not necessarily a drop-in replacement. In order to get optimum noise performance, and to ensure stability, you would need to re-evaluate the other components in the system, such as the value of the input and feedback resistors, etc.

One which is more likely to be a direct drop-in is the National LM837. It has similar performance to the NE5532, much better than the 2058. Specs include: distortion 0.0015%, noise 4.5 nV/sqrt(Hz), GBWP 25 MHz. Most people around here wouldn't call it audiophile quality, but it will be a big improvement.
19/12/08 6:11 PM
Anonymous said…
Why the upgrades? I'm still of the opinion "critical listening" is largely a waste of one's time, energy and intelligence. That's not to disparage the people who do it for a living but that accounts for just a very small percentage of us. In even those instances too many times the cart is placed before the horse and the effect of the music the system reproduces is all but forgotten in order to discuss the sound itself.

You have "X" amount of time on this Earth. You have "Y" amount of time to listen to music you enjoy. You have "Y x ?%" of that time to listen to reproduced music.

Use your time wisely.

Just listen. The more you get involved in judging your system or the sound it produces the less time you'll spend enjoying the music it provides. IMO the most difficult thing for most "audiophiles' is to sit and listen to music and not judge (and all too often nitpick) the system's sound whether the system is their's or it belongs to someone else. Once you fall into the habit of judging, listening for enjoyment will forever more be hopelessly your second choice. You'll be listening to music you really enjoy and before you know it - BAM! - you'll find yourself not intersted in the music because you're sitting there judging the performance of the system.

It's a waste of time I tell you.

What are you going to do if your system has "brittle" highs? Stop listening? Buy something new? Call your friend in the middle of the night to tell him about what you've heard? Worry? Spend your next few days searching the internet for the solution?



There's a glossary of terms on this site, go to the search function and enter "glossary" to access it. If you need to know what you've just heard, that's as good a place as any to begin. But who are you going to tell that the sound was not as "silvery" as you'd like?

I'm all for knowledge of how your system operates and how to discuss its benefits and pitfalls but there's a time and place for everything. If I have "Y x ?%" of it to just sit and enjoy muisc, that's what I'd choose to do. The rest will come as you listen and enjoy. It's like learning how to cook, you only learn it by doing it. You only do it well by tasting the end result not reading about it.
24/12/08 5:27 PM
Anonymous said…
The LME's have specs almost exactly the same as the 4562's and people say they sound different.The specs aren't almost exactly the same, they are exactly the same. I compared the two data sheets line-by-line and graph-by-graph, and the only difference is the part number itself.

I wrote National Semi an e-mail asking about it, and the answer I received said, and I quote, "The LM4562 and LME49720 are the same part." The reply went on to say that the part with two op-amps inside (the dual) was created first, before they "had the part numbering brainstorm" and came up with the LME series, including the single (the LME49710) and quad (the LME49740) versions. They gave the dual LM4562 a number in the new series as well, the LME49720.

It's really funny (and telling) how some are, um, "hearing" a difference between these two parts. :)
25/12/08 11:45 PM
Anonymous said…
Can't wait to hear your findings for the upgrade from TL074CN. I too am looking at replacing the TL074CN with a LME49740. As you know the TL074CN is a jfet and LME49740 is a bjt. Do let us know your findings. Cheers.
5/1/09 7:18 PM
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