Burr Brown OPA134 ?

[crm0922]

[quote author="fatboy135"]

When I first swapped in the OPA2134 it was literally a jaw dropping difference. The increase in clarity of the high end was amazing.

Totally agree it happens the same to me. But I couldn´t understand how changing a simply ic on a circuit could develop new sounds, it is a mystery for me[/quote]

I've noticed that the Tl072 sounds different depending on how much of a load it is driving. It seems it likes to see a pretty high impedance. I'm sure this accounts for some changes in sound when swapping opamps around. Maybe yours was a bad design for a TL072.

Chris