There still seem to be lots of NOS tubes around. And I imagine that other factories will ramp up out of necessity. I'm not sure if there's a need to raise prices if you're not buying them wholesale at a higher price.
Tubes becoming hard to get?
An article in today’s WSJ talks about tubes for both guitar amps and stereo gear becoming scarce due to Far East and Ukraine/Russian tensions saying most tubes originate from China, Slovakia, & Russia. As such, people are beginning to Hoard and retailers are beginning to limit purchases.