Reliable source Psvane CV181-T MKII

Shuguang Electric Company experienced a fire in August 2019 and burned to the ground. They made HAM radio amplifier tubes under an assortment of names like RF Parts, Taylor, Machlett. Their quality was typical Chinesium compared with other countries like Russia for example.

China never issued a permit to rebuild the factory so a group of ex-employees left and started PSVANE. Once again, poor quality and failure rates higher than acceptable.

Russia no longer exports tubes in retaliation for the sanctions so PSVANE has capitalized on this demand.

Definately not on a smear campaign.  PSVANE is brought up in the HAM radio community often when it comes to replacement amplifier tubes and I picked up my info from there.  If I was inaccurate as you are pointing out, I will retract that.  There is still an issue with the quality of PSVANE tubes in HAM radio and there are not a lot of alternatives to choose from.  The prices are also unrealistic.

Sovtek tube ban

​ Russia imposed a ban on the export of *all* tubes.  It is news to me US companies are still making tubes.  The last I read, the only exemptions are health care manufactures, health care companies and drug makers.  Russia specifically banned the export of vacuum tubes.  Electro-Harmonix, which distributed Soviet tubes announced earlier this year that they could no longer supply Soviet tubes due to the ban 

https://www.guitarworld.com/news/electro-harmonix-russia-tube-exports-ban

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cleeds, thank you for the clarification