It’s clear from your post that you are new to tubes and your intent is to introduce tube sound to your system to see it’s right for you.
My advice:
1. Buy a tube amp to fully experience tube sound not a tube preamp to use in front of a SS amp.
2. When moving in the direction of tube audio for the first time do not buy new, buy preowned.
3. When selecting a tube amp be aware that the equivalent sound/usable power ratio compared to SS is about 4:1 meaning a 200w SS amp can be replaced by a top brand class A 50W tube amp.