RIAA with 4 common tubes

[aria]

I adapted an old circuit using 4 common tubes, what do you think about it?

 

[petertub]

Looks very complicating. Is there a point with that complexity ? As it lack NFB it's also sensitive for
tube parameters..

 

[Miniwatt]

Looks very complicating. Is there a point with that complexity ? As it lack NFB it's also sensitive for
tube parameters..

There is some local feedback around X2.

 

[aria]

Looks very complicating. Is there a point with that complexity ? As it lack NFB it's also sensitive for
tube parameters..

In fact, it's very complicated and I don't know if it's worth it ... the two triodes below deal separately with frequencies between 20 and 1k, the other two from 1k to 20k.

 

[aria]

Provided that Microcap's results are true (I have several doubts), there are two issues I would like to understand first:
1) Whether to place the voltage gain stage downstream or upstream.
2) What types of caps to use (apart from the usual decoupling and bypass caps).

 

[aria]

Perhaps you can simplify a lot by using a passive RIAA and 2x6EM7 per channel for the amplification stages and also have a medium-low output impedance without having to use a CF. What do you think about?