I have received "something" and works fine! As Robert stated this is 4T and have tube sound.
From outside I cannot tell this is 4G or 4T at all, because everything looks similar (case/switches).
Just now found on board layout some difference (below right side screw), as maybe this op amp replaced with some components.
I wonder now which op amp in it. <-updated
But seems the EMI noise lowered by much, but still there (10/8 -> 10/3). I still need to switch to...