Ok, here's what i did today, replaced the opamps for these vertical vero-boards with an 8-pin socket for changing opamps, as you can see in the picture.
It seems absurd, but no AD or OPA's can be found anywhere!

What other choices do i have?

I bought 2 NJM4580 for now, at least they are a bit better than the originals.
BTW, Guido, you're right, i have written donw one reference incorrectly, i have 1x LC7881 and 1x LC7860
