NCdan said:JJ actually has their own plant, and they're the ones the guys at Eurotubes sell (I highly recommend Eurotubes; they really know their stuff). Fender just bought Groove Tubes (which are just the good Chinese tubes, anyway), and Ruby tubes are mostly better Chinese tubes. Then there are the Electro Harmonix tubes. I haven't been able to try them, but I'd assume they're made in the USA. Maybe EHX tubes are a match for JJ? Anyone tried them? But JJs are the best I've tried SO FAR. And I like JJs because they're quiet, relatively consistent, and don't compress when they aren't supposed to.
To my knowledge Electro Harmonix is Russian today, used to be NYC.