People are less afraid of low power cheap preamp tubes than high power expensive amp tubes.
This was the issue holding me back from taking the plunge into tube amplification - just pain scared of the arrays of power tubes: cost, biasing, maintenance, do I leave it on all the time and warm up the room, or turn them off at night... etc.
My first exposure to tubes was at a dealer many moons ago listening to Audible Illusions and Exposure (no pun intended) amplification. Tube sound with no power tube maintenance and fear.
Fast forward to now - I'm running Rogue M-150s off the analog output of my NAD pre/pro for stereo listening. The tubes cost a lot, and yep - they're a bit of a hassle to maintain compared to SS amps - but wow, the SOUND. 😁