Alas I fear Tyson's assertion the Chinese sources like Psvane are sufficient to fill the loss of Russian tube factories is a bit of whistling past the graveyard. Granted those of us who tend to hang out in the power triode world where a couple of 2A3s or 300Bs is sufficient can squeak by suffering the 25% cost increases that are the defining trait of 2022. The world of hurt will be the large scale users of audio power pentodes like 6550, KT88, KT66, and new designs like KT150s. Companies (and owners of) amps that specialize in big tube amps using 4, 8, or more pentodes like Audio Research, VTL, and Valve Amplification Company are in for a rocky road. They depend on using a stream out of the river of power pentodes the Russian factories supply to the guitar amp industry.