Hi stein
In the first post i left a sim with complete circuit.
Hi Ricardo
Thank you, but to see it I have to install LTSpice and that is not going to happen.
I have looked on some of your previous posts and can see your "design".
I think you should try a 10k pot. with the wiper connected at the positive rail and the element between R1 and R2 see the drawing, that should null the DC offset at the output.
(This i my opinion: I would not null the offset like Damian is suggesting and in case you intend to use a DC servo I would not connect it to the negative input.)
One question why do you select this design and what is the reason you have chosed to use JFET ips instead of BJT?
In my opinion, if you for some reasons prefere JFET ips instead of BJT there are much better ways to design a circuit with lower noise and THD that will fit into a 990 package.
Stein