While there are a multitude of Chinese made tube amps available online, there are also a number of small scale manufacturers around the world producing quality gear. Share links to these tube amp makers here. To start off:
Eric Chan based in Sydney, Australia who makes McChanson amplifiers: https://www.mcchanson.com/
At one point I considered doing a small production run of my 6SQ7/EL34 amp, but product liability (high voltage lawsuit, "No one told me not to poke a fork inside it") and customer support headaches changed my mind. Also not sure how well a $1200 product in this class would sell, folks would want to pay Reisong A12 prices and the parts cost more than that amp retails for.
Aah, McChanson, what an icon down under. Ive always loved the name and reading his ads on Gumtree.
Bottlehead and Spud Kit are institutions in the US. While mainly in the kit business, they also build them for customers who can’t wield a soldering iron.
Decware is famous of course, and is also a tiny family business, fiercely hanging onto that structure. So popular that wait times are stretching into 2 years nowadays.
In Europe, there is Doge, basically a one-man show run by Marc Doge. Marc is a really nice guy, always ready for a chat. He has a small team building his amps in China.