WTB: Genuine OPA627 DIP8

[RollE2k]

Looking for a pair of these.. let me know if you have a pair for sale!

 

[jean-paul]

Hi I have 637's but I guess you don't need much gain ?

 

[RollE2k]

Hello J-p, i will use them as servo for paradise phono-stage, and i personally don't know if the 637's would work better or worse?

 

[jean-paul]

I would not use either 627 or 637 for servo purposes. Forget what I say, I used LF411 for servos

 

[RollE2k]

Why not 627? it's what is considered best for paradise it has the least instability from what i have read (and what people have said when building paradise).

 

[jean-paul]

All I know is that 627/637 are good in the signal path and that they are high bandwidth/high speed/expensive so not really the best for servos (only low offset is the right parameter) where you need slow low noise opamps with low offset numbers. In the past the LF411 was one of the most suitable with good results for that reasons. I am too lazy now to compare specs. BTW they only cost 1 Euro...

Yes you can buy your groceries and use the Ferrari but a shopping cart might be more practical...

 

[jean-paul]

Try the LF411A just for the fun of it. Not as good as OPA627 with 300 µV against 100 µV input offset but a tad better than OPA134. It would be very nice if it gets the output at near zero V DC just what should be its only task.