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Old 11th January 2007, 04:43 AM   #1
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Question BB OPA637 okay in these applications?

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
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Old 11th January 2007, 10:53 AM   #2
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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
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Old 11th January 2007, 02:50 PM   #3
ckng is offline ckng  Singapore
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I posted a similar question to yours in this thread earlier:-
OPA637AP in Rotel RCD-02

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
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Old 12th January 2007, 07:21 AM   #4
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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
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Old 12th January 2007, 08:08 AM   #5
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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.
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