Do tubes matter beyond gain stage on preamp?

@emergingsoul said: "So better to have a couple tubes vs no tubes.

ie. Harmonic distortion is highly desirable vs flat ss."

I'm not sure I agree with that broad an approach. You can discuss euphonies and take it to an extreme, but not all tube equipment sounds like tubes. And contrariwise, I had a line stage with a solid state audio path in one chassis and a tube rectified power supply in another. I did not sound like solid state. 
If this is just to chat about tube properties being less desirable, I'm not your guy. 

what i find interesting are the designers who are capable of working w both…. two come to mind … Vandersteen and Aesthetix..there are a lot more if we throw the use of FET as front end to tube phono stages, many many more….. 

@noromance yes! i have same neon and swap was meaningful, there are two “ hidden “ FET in my RS

Shall, I send it your way for the cold midwinter ?

Not sure why power supply tubes in a preamp impact harmonics?  Maybe cause it cleans up power.  If input components, eg streamer/phonostage, connected to preamp all have great power supply than preamp power tubes would seem less important.