[sdiy] best opamps for line level to synth level preamps

[Ingo Debus]

Am Samstag, 23.07.05 um 01:11 Uhr schrieb megaohm:

> I've swapped the following opamps for the TL071/TL072:
>
> MAX437 - I couldn't detect a difference.
>
> OP27 - same.
>
> OP275 - same. This distorted earlier as I raised the input level.
>
> OPA2134 - same
>
> I repatched and changed channels so many times I became confused as to
> which opamp or preamp channel I was hearing. I thought this would make
> me more objective. It must have because I couldn't tell one opamp from
> the other.
>
> The circuit itself may have to be tweaked for each opamp to bring out
> their best performance. Also, different qualities and size of caps
> could play a significant role.
> My studio setup may be to blame for the nondifferences between opamps.
> I consider it far from ideal.

I rather suspect you just destroyed another audiophile myth. ;-)
I bet many of those who claim "this opamp sounds better" never did a 
direct A/B comparison like you describe.

At which gain were the opamps running?

Ingo