Different LME47920s In Topping Dx7 Pro

[Rotary Transformer]

I upgraded my Dx7 Pro with OPA1612 yesterday and found there are 3 different types of 4 LME 47920 op-amps in my Topping Dx7 Pro.

I felt sort of uncomfortable even though I knew it doesn't matter the sound.

However, from the attached pictures, the third one seemed to be used with marks rubbed off and last one is a different package.

Any thoughts?

 

[ReaderZ]

Interesting, would like to know as well

 

[mansr]

The package variations could simply depend on which plant manufactured them.

I'd be more concerned about the long, thin, high-inductance traces on that break-out PCB. That's not going to do any favours for power delivery to the chip. I would have used the smaller DFN package to avoid the 90° rotation.

 

[Wombat]

The things people worry about.

 

[gino1961]

I upgraded my Dx7 Pro with OPA1612 yesterday ....

Hi ! may i ask you why ? do you deem the OPAs superior to the LMEs ?
thanks, gino

 

[wric01]

Sparkos 3602, your last opamp and end game dac. For golden ears only as only they can hear it, as these audioscience folks here can't hear it as their measurement numbers matter more not your ears.

 

[trl]

For golden ears only as only they can hear it, as these audioscience folks here can't hear it as their measurement numbers matter more not your ears.

It's all in the measurements, just need to look up closely.

 

[Roland68]

Unfortunately there are also fakes of this OPA.
That's why I've only been buying my chips from authorized distributors for years. If an OPA costs significantly less or a fraction of the 1000 price from one of the distributors, where should it come from?
These fakes can often be exposed by measuring individual parameters, often by too high a current consumption.

In recent years the situation has gotten even worse, as not only old, old layouts, used or inferior chips are re-labeled, but also real copies, more or less good, are produced.