There aren't many vacuum tubes being made for consumer products any more other than CRTs. Back in 1992, I was working to get funding for an upgrade project on the Eglin phased array radar. It was perhaps the first large phased array with about 4000 transmitter elements. Each element was powered by a vacuum tube. By 1992, the only source we could find for those tubes was Russia. From what I've heard, even Russia doesn't make many tubes anymore.

Perhaps that will change. Some high end audiophiles are keeping alive tube amps. They're convinced tube amplifiers have better sound than solid state amps. If the demand is there, someone will step up to meet it.