Solid state or Tubes preamp phono stage.

"This or that"-SS or tube threads never get far...

It a subjective thing determined by the listeners ears-pretty simple.

""What I can say if you want equal to Trumpet you need to look in the 20-50K$ price range

That's some endorsement. No need to look for a used  Herron, Manley Steelhead or an ARC Ref10 for that matter.

I do believe in all the positive user comments on it, but $50K?

" Plus they can run hot."

Maybe this one is a little warmer than others, but small signal tubes compared to power tubes are not space heaters.

Average units just 2-4 maybe?

sksos-unfortunately, I'm not a user of the NVO-yet. Only been a distant admirer since it was the 15 minute internet darling years back!

When I do the next table upgrade, the SPA will be on my list. They seem to be a rare animal on the used market-get snapped up quick when they are listed.

I will be contacting you when that happens! My 10 year of tubed Fosgate has held off the usual suspects for now. Only 7 tubes, and certainly not a heat concern.