Can anyone help to identify an op amp

[pet_rushi]

OPA132 doesn't work, I've tried it.
I have to try NE5534.

[David Hess]

U2 is part of a feedback loop around the output stage, so its high frequency performance may affect stability of this whole composite thing. This chip may be more sensitive to substitution. The pinout implies it's a single, so maybe NE5534 or one of the OPA16x1. National also had some LME49xxx single audio opamps, but I think they have all been obsoleted by TI.

Local feedback capacitor C9, and the parallel resistance of R8 and R11, dominate the frequency response of U2, so the selection of U2 should not be critical.

For U2, start with checking for any resistance between pins 1,5,8 and either of the supply rails. And see what's the value of C71 and R8, because it could possibly be a JFET input opamp. Maybe OPA134, OPA627 (crazy but why not), OPA1641, or something from AD/LT.

R9, and the parallel resistance of R8 and R11, should give some idea of the ratio between the input voltage and current noise of U2, and that will indicate if it is a JFET or bipolar input part.

I would probably start with the OPA1641 or OPA1655 as a JFET universal audio operational amplifier, and the OPA1611 bipolar audio operational amplifier if the value of R9 is below 1 kilohms, which seems unlikely because C16 implements a low frequency cutoff.

Alternatively, pull U2 and put it into a test circuit to measure input bias current and slew rate.  These two things will narrow the options down considerably.