BB OPA637 okay in these applications?

[marchewd]

I am going to swap out the opamps in my Music Hall CD25 player. I know the 627's work in this player (with BrownDog adapter and 2 chips), but was wondering about the 637's, as I can get a much better price on compared to the 627's. Or would a discrete opamp, like this one work out better? www.bursonaudio.com/burson_hdam_module.htm ?


Any and all help would be greatly appreciated!


Thanks,
Dan

 

[Epicurean]

I would say no. I doubt your CD-player has a high gain and the OPA637 needs a minimum voltage gain of 5 whereas the OPA627 is stable at unity gain. I have OPA637s in my headphone amp and a gain of 6 was too low so I raised it to 10 and now its working fine.

btw. that link of yours didn't work

 

[ckng]

I posted a similar question to yours in this thread earlier:-
http://www.diyaudio.com/forums/showthread.php?s=&threadid=91937&highlight=

Tried 2 OPA637APs per channel on my Rotel RCD-02 and it didn't work too well either. There's quite a bit of noise which I think is due to oscillation.

You might want to try the LM4562s if you can get hold of them. General opinion is that it's better than the OPAs.

Regards
CK

 

[marchewd]

Thanks

Thanks for the replies. What about using the 637's in either a Jolida JD-9 phono pre or Rogue Stealth phono pre?

Thanks,
Dan

 

[musicfan_cbs]

In my opinion OPA627 is a better/safer choice (although more pricey). It is a lot easier to integrate that 637 (-->>voltage gain) and from what I've heard so far yields a bit better sonic results (in both cd-players and preamp stages).
I think you should at least buy a pair of opa627 and compare the results.