Drop in replacement for OPA2134 opamp?

  • Thread starter Thread starter dickiefunk
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dickiefunk

dickiefunk

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Hi,

I recently bought an ART MPA Gold and am planning to upgrade the tubes and opamps.

I read that the OPA2134s are socketed on the MPA Gold.

Is there an opamp that would be a good drop in replacement?
 
dickiefunk said:
Hi,

I recently bought an ART MPA Gold and am planning to upgrade the tubes and opamps.

I read that the OPA2134s are socketed on the MPA Gold.

Is there an opamp that would be a good drop in replacement?
Click to expand...

The 2134 is a nice opamp and I don't think that you will see much gain by replacing it. But, what the heck, I like replacing opamps!

SO I would try the lme49860 or lme 49740....

-Ethan
 
Well it depends on the circuit. I am not completely familiar with the ART MPA.

But anyway the OPA2134 is already a fairly highly regarded OpAmp. Typically it is the recommended upgrade to many OpAmps.

Any upgrades to that will be expensive, may not offer that much of an improvement, will be hard to find, or may have troubles with oscillation and stability in that circuit.

In that range probably the only ones that would be worth trying would be an OPA627 or AD797 with a single to dual adapter board. Maybe try an LM4562 which is new but many people like. Maybe an OPA2227.

What you can do to is go to TI's, AD's, and National's website and use their Cross Reference search.

Personally I would leave it alone. Focus on the tubes which more people suggest changing. Look also at caps worth changing or bypassing in the signal path or feedback loop.
 
Kids these days! Time was people would swap IN OPA2134!

I don't think you'll gain much as the MPA doesn't hit the OPA2134 distortion spec anyway. Whether this is due to the tube or its discrete bits I don't know, but it sounds a bit softer than a straight OPA2134 preamp. I would upgrade the tubes and leave the rest of the box alone.

I am most familiar with the TI range; OPA2227 is slower and so ever slightly dirtier than OPA2134. It is quieter, but that doesn't matter as the MPA noise will be dominated by its discrete input stage.

If you're really desperate to mod this box, add some input transformers!
 
mshilarious said:
If you're really desperate to mod this box, add some input transformers!
Click to expand...
That's what I want to see :D

I also have no urge to replace the OPA2134s in my Digital MPA. I've been putting them in all my other equipment as an upgrade.
 
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