Prof, if you purchase Russian tubes and they are restocked via China, as mentioned in a post above, you should consider if you might be supporting the Russian economy by doing so.
No, the Russian tubes simply won't be getting to our shores at this point. Purchasing the existing Russian tubes from local vendors does not mean you have supported Russia or that Russian tubes will be restocked. It's supporting local vendors who are STUCK with that product! We'd only be hurting local vendors and that's it.
It seems you also want us to not purchase any Chinese tubes either? Well that's pretty much it for tubes then. I guess you are fine with many of the long time tube vendors going out of business? Nobody can use their tube amps anymore?
Should we boycott everything from China? (Good luck). Boycot everything from anywhere that is doing ANYTHING wrong? (That will be almost every country).
It makes more sense to focus actions during ACUTE emergencies on that which will actually have some direct effect. Not purchasing the current local vendor stock of Russian tubes may make you feel better, but it wouldn't do ANYTHING to help Ukrainians.