[Ian Iveson]

Eeyore wrote

I haven't suggested that West uses a 10k pot. The cathode follower
would prefer the 100k.

On the basis of what principle do you say that ?

It's a 12AX7. Look up the curves and draw yourself a 10k loadline.

As I posted earlier. 100k is not a great choice for driving cables.
It can also
increase the background noise level.

It's OK in my case, thank you. We have already explained why.

The idea of a "passive pre" is problematic for valve sources in my
view.

Ian