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Old 17th July 2003, 06:59 PM   #1
JoeBob is offline JoeBob  Canada
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Default OPA627BP or OPA637BP for preamp?

Anyone have a preferance between these two for a preamp stage? I ask because many like the 637 for phono and the 627 for IV, but what about a simple preamp?
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Old 17th July 2003, 07:53 PM   #2
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Both types are excellent as long as they work in optimal conditions but also there are at least a dozen of good other opamps, which are substantially cheaper.
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Old 18th July 2003, 07:23 PM   #3
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I once built a headphone amplifier which used the 627, followed by a 634 buffer. Swapping the 637 for the 627 resulted in a much more rounded, natural sound to my ears. Both sound great. Just note that the 637 is not unity gain stable and needs a gain of at least 5.
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Old 19th July 2003, 02:35 AM   #4
JoeBob is offline JoeBob  Canada
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Thanks, I already have some of both and was wondering which to use, I think I'll give the 637 a go and see how I like it.
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Old 12th September 2003, 03:38 PM   #5
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how did it go...?
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Old 12th September 2003, 05:39 PM   #6
PMA is offline PMA  Europe
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637 is stable for gain 5x and more, 627 can be used for gain 1x and more and has lower basic distortion.
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Old 12th September 2003, 06:56 PM   #7
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Quote:
once built a headphone amplifier which used the 627, followed by a 634 buffer. Swapping the 637 for the 627 resulted in a much more rounded, natural sound to my ears
Impression seconded in a phono stage. What i really don't get though is why JoeBob is lazy to compare them himself. Too much work?
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Old 12th September 2003, 07:48 PM   #8
JoeBob is offline JoeBob  Canada
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I did compare, I just wanted to see what other peoples opinions were on these parts.

I tried them and my preferance was the 637, gave better sound in my opinion. I liked it alot more, not just a small preferance. But for unity gain, I tried the 627, but in this place I liked a monolythic buffer more ( I used the EL2001).
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Old 13th September 2003, 02:35 AM   #9
PGW is offline PGW  United States
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Does anyone know how the 627/637 compare with the regular OP-27/37?

Are the 627/637 quite different internal architectures but designed to do (essentially) the same job as OP-27/37, i.e a pin-for-pin replacement in the appropriate circuit but with "improved" performance?
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Old 13th September 2003, 03:14 AM   #10
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Hello,

I am just today replacing my AD826 in my pre-amp stage with (2) OPA627AP.

I will let you know how I like the new op-amp.

It is a chore to do this swap without the Brown Dog adapters.

Cheers

KevinLee
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