JJ in Slovakia is in full production. AFAIK the only other factory is in Russia. China closed its factory in 2019. The factory in China manufactured Ruby, Mesa Boogie, Valve Art, Golden Dragon and other smaller brands of tubes. The factory in Russia manufactured Sovtek, Electro-Harmonix, Mullard, Tung Sol, Gold Lion, Svetlana, Mesa Boogie, and a few smaller brands of tubes. I can only imagine that the QC will suffer as JJ tries to keep up with demand.