@rauliruegas: I for one appreciate your efforts to sift through all of the information here and especially Roger's posts. Specifically you noted what I am starting to think is one of Roger's main points which he has mentioned to me a number of times and which I quote from your post:
What I can see is that ramtubes is rigth in that the RIAA original is
not the one for magnetic/velocity cartridges that needs a compensation.
That orginal RIAA pre-emphasis ( two octaves ) is for displacement
cartridges. So, he is rigth.
Now as for the dark points, based on my conversation with him today this might provide a bit of a clue (specifically the second sentence) which is from one of his previous posts:
The 40 dB curve that 99.9% of us call RIAA EQ is the combination of RIAA
plus the EQ required for a velocity (magnetic) cartridge. Let us not be
thinking that the groove itself has 40 dB (100 to 1) of EQ but indeed
just 4 to 1.
I will wait and see if Roger posts to allow him to explain this. Otherwise I will try and reconstruct my notes and see if I can do justice to it.
At this point I am not terribly concerned about right or wrong, it is a situation where we may have two rights, or the status quo (the Bible as Raul puts it) versus a different way of looking at this (Roger has been known to think outside the box and I don't think he disavows the 40 dB curve). I am far from an expert, certainly won't claim to be "widely read" (or more appropriately well read) on the subject, and what is being discussed by the two people who I consider the experts here (with kudos to Raul for persevering through this) might as well be Latin to me.
What I do know is I have two phono stages designed by Roger (RM-1 and "RM-6") and both have extremely accurate RIAA measurements. Perhaps I can share more tomorrow if Roger has not already done so.