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I got this little headphone amp board from a Japanese hifi magazine. It uses an OPA2134PA opamp chip (plus another 2 for balanced operation). I think I've seen somewhere before that opamps in a headphone amp can be easily swapped with substitutes to have a different sound, but I have no idea what chips are proper drop-in substitutes. Any idea?
Thanks.
Follow Ups:
LM4562 (LME49720)
but they need a lot of burn-in, they are VERY disappointing for the first couple od days, thin and bright; after that they mellow down while staying super clear, liquid and detailed, with absolutely no distortion and good dynamics.
Edits: 06/16/16
I'd say you are lucky to have the OPA2134 as your initial op amp. It is my favorite so far in my very recent op amp rolling. Not so easy to beat IMO. Of course it depends on what any individual likes. It's well balanced, has very good timbers, excellent bass and is musical. The often recommended bi polar LME49860 and it's close relatives are or can be extremely clear and fast and are considered by some to be clinical and sterile. I found that to be true but did not take time to break it in. It was too disturbing to listen to. Consider living with it for awhile before you drive yourself crazy rolling op amps. I suggest you replace some of those electrolytics with Elna Silmic ll or Nichicon KZ's. Some find the Silmic ll too rolled off. I love them myself. I have one more op amp to try, the OPA2132 and will then stop rolling, I think? T
Thanks, guys!
I just found an article on their site saying that the following would work as drop in:
OPA2134PA
JRC/ NJM4580DDJRC / NJM5532DD
MUSES MUSES8920D
LME49860NA
Any idea about these opamps?
Edits: 06/14/16
Could you post the url for where to get this headphone amp. Thanks.
Builder of MagneQuest & Peerless transformers since 1989
Please do a search within this forum and you should come up with some I.C's and other suggestions you are looking for.
Just make sure the sub I.C has the same gain as the OPA2134.
More important than the gain is power supply voltage. Put a 5v opamp in a 15v circuit and you get melted plastic or loud burst of noise or no sound at all.
There is nothing wrong with the sound of the 2134, and many prefer it to any other. I find it a bit too smooth and prefer the electrically equivalent but slightly more detailed LM49720. There are pages and pages of opinions about "best" opamps. Some opamps will sound significantly different but not necessarily better, and many will yield very minor changes.
What are you hoping to accomplish? Truth is, you could probably improve the sound more than rolling opamps simply by removing those cheapo sockets and soldering the opamps directly to the boards. Even good sockets are unquestionably a compromise, and those look to be less than good.
Peace,
Tom E
berate is 8 and benign is 9
Thanks.
I'm actually not trying to accomplish anything (yet), as I'm just beginning to toy with this thing, but am trying to learn what options I have in the future. I absolutely agree that it would more often be change rather than improvement with these and other tweaks, and it will be done purely for fun and exploration.
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