So I've been following Western Electric and they are planning in producing the 300B again, in America. If this all pans out, this would be the only current production, American made tube (that I'm aware of anyway). Right now they are only producing 300B's and I have no idea if they will be producing other ones yet (or ever). I attached a screen shot of an email I received this morning. It will be interesting to see if this pans out.
Here's their Youtube channel:
https://www.youtube.com/channel/UCnqk0XSDF_a2FHBfoRqpxuAAnd website:
https://www.westernelectric.com/