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"WHAMMY" Pass DIY headphone amp guide
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Old Today, 05:58 AM   #881
mercedese63 is offline mercedese63  United States
diyAudio Member
Join Date: Apr 2018
Originally Posted by cubicincher View Post
Hello Mercedes63,

I did not try the newer OPAMPSs in SOIC. But I ordered some adapter pcbs (SOIC - DIP8).
You wrote, that some of the best OPAMPs are singles.
Do you refer to the OPA627 / 637?
Can you give some advice which OPAMPs you prefer (singles and duals)?
Only one or two. Testing will go on.

Sorry for the late response. Worked the whole weekend.

Best regards
Hi Dirk,

No problem with your late response.

Yes, the OPA627/637 are considered by many to be some of the better sounding op-amps. They seem to have a loyal following after receiving a favorable review from tangentsoft's website.

Personally, I prefer the sound of the ADA4627-1 over the outrageously priced Burr Brown OPA627/637 offerings.
You may also want to try one of Scott Wurcer's "oldie but goodie" offerings-the AD744. The dual version is the AD746.

For dual op-amps you may want to try some of the JRC offerings-NJM2068, NJM4558, NJM4565, NJM2114 and NJM4580.
They're all inexpensive and can sound VERY good in the right application.

Other great sounding duals are the LT1361 and LT1364. Both have higher input bias currents so always measure the amount of DC offset at the outputs before connecting any headphones.

Good luck and have fun!
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Old Today, 09:59 AM   #882
cubicincher is offline cubicincher  Germany
diyAudio Member
Join Date: Mar 2016
Location: Hechingen, South of Germany
Default Thanks!

Hello Mercedes 63,

thanks for the tips!
I have ordered the LT1346.
Never used one of the NRJs. I will have a look on them.

Have a nice day!
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