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-   -   Upgrading ICs in headphone amps (http://www.diyaudio.com/forums/headphone-systems/220400-upgrading-ics-headphone-amps.html)

batty 26th September 2012 01:08 AM

Upgrading ICs in headphone amps
 
I am considering buying some Moon modules from Audio-gd to replace the OPA 2134 I have in my headphone amp, has anyone tried this, I also have ordered an AD823AN as it was cheap.

qusp 26th September 2012 01:56 AM

it might be handy to know what amp specifically you are talking about…

BionicSniper 26th September 2012 02:00 AM

Waste of time and money. Unless the amplifier was designed incorrectly in the first place and is not meeting the requirements of the op-amp; it is unlikely that the performance would increase.

If you are going to:
-Measure the before and after performance with test equipment.
-Modify the amplifier to the requirements of the new op-amp.
-Use a proper audio op-amp and not one designed for something else.

Then you may be able to net a performance increase but at that point you had might as well just design your own amplifier.

If it sounds different after you changed the op-amp it will be because:
A)The amplifier incompatible with the original op-amp
B)The new op-amp is more compatible than the old op-amp
C)You think it sounds different when it really doesn't (NOTE: the above two are more likely in this circumstance).

So again, waste of time and money.

batty 26th September 2012 03:32 AM

I have 2 amps, both built from kits, the CMoy and one from Oatley Electronics.

Edit: I have a pair of OPA627s coming too

jcx 26th September 2012 04:41 AM

the 1st question is always - what headphone? - impedance, sensitivity numbers

headphones vary by orders of magnitude in these parameters, impacts amp requirements

batty 26th September 2012 05:08 AM

HD414 at the moment looking at 595s

qusp 26th September 2012 09:04 AM

Quote:

Originally Posted by BionicSniper (Post 3179143)
Waste of time and money. Unless the amplifier was designed incorrectly in the first place and is not meeting the requirements of the op-amp; it is unlikely that the performance would increase.

If you are going to:
-Measure the before and after performance with test equipment.
-Modify the amplifier to the requirements of the new op-amp.
-Use a proper audio op-amp and not one designed for something else.

Then you may be able to net a performance increase but at that point you had might as well just design your own amplifier.

If it sounds different after you chhttp://www.diyaudio.com/forums/data:...Grp+983ycAOw==anged the op-amp it will be because:
A)The amplifier incompatible with the original op-amp
B)The new op-amp is more compatible than the old op-amp
C)You think it sounds different when it really doesn't (NOTE: the above two are more likely in this circumstance).

So again, waste of time and money.

I know you are just towing the party line, but this is rather incomplete and one line didnt fit your conclusion, but you simply ignored that and made it fit.

Quote:

B)The new op-amp is more compatible than the old op-amp
which can relate to fitting the amp, or the headphone load better, how pray tell would that be a waste of time and money? sorry but this is most certainly not a perfect model of a world we live in, design mistakes, as well as unexpected load interactions can and do happen. your model for reality is flawed (oversimplified) and thus useless

a simple CMOY is never going to meet your expected model, but youre correct, while you may make some changes by choosing a better opamp for it, it would be better to just choose a properly designed amp and build it

Mooly 26th September 2012 09:29 AM

You can sweat the technical stuff ad-infinitum... the reality is that opamps can and do sound different although those differences escape being qualified in the normal sense.

Try the wild card... the TLE2072 excalibur FET opamp which as excellent drive ability.

And as always,
http://www.diyaudio.com/forums/analo...avent-you.html

doulos24 26th September 2012 02:54 PM

the TLE2072 is nothing more then a slightly quieter tl072 they sound the same they can be pleasing in the right circuit but nothing amazing

Mooly 26th September 2012 04:07 PM

Quote:

Originally Posted by doulos24 (Post 3179733)
the TLE2072 is nothing more then a slightly quieter tl072 they sound the same they can be pleasing in the right circuit but nothing amazing

Not so :)

There are many differences. The TLE2072 has a -/+ 80ma output capability (per opamp in the dual package) which puts it way ahead of the competition.
Slew rate of around 35V/us, a wider operating voltage range.......


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