Do HT enthusiasts pair processors with tube preamps?

Seems a nice stereo tube preamp when layered between a processor and main spkrs is a really good way to enhance SQ.

Anyone do this?
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Yes. Theta through VAC.
How many threads do you need to start in multiple forums regarding this? Supposedly you have a NAD through a Schiit and running your multichannel Mac amp in 2 channel only.  What are your center and surrounds btw?

IMO, Changing your tubed pre to a high end one won’t do much for your overall HT experience.  Separating your HT from a 2-channel setup would be best. If your focus is on HT, then just get a better pre/pro