JJ tubes are a goto for me as a regular working musician. They are of consistent quality and reasonably priced, made in Slovakia. I toasted my "golden ears" playing rock music for 40 years so fancy high $$ NOS tubes have no place in my kit.
https://www.tubedepot.com/t/brands/jj-electronic-tesla?gclid=CN3TkKK_jb0CFRFbfgodsiQALw
Amazon also has em.