Replacement for op amp listed in mp-1 noise mod

[kissfan113]

I was checking into parts for the noise mod for my mp-1s today and see that the TL072IN chip listed in the mod is obsolete and unavailable, what would be a suitable replacement for this ic?

[MarshallJMP]

What revision of the noise mod did you look at?

[kissfan113]

I think it's version 1 ca.2003

[MarshallJMP]

Ok that's an old one, get a OPA2134AP for U4, don't change U9. Now the TL072 is not obsolete at all but the OPA is better.