[snip]...I read a few articles that they changed hands or something and Svetlana is basically Sovteks with a new name.
The New Sensor Corporation (who also sells EH and Sovtek brands) now owns the Svetlana trade name in North America. So there was a change in the US, but not in Europe. The original Svetlana tubes are now marketed under the SED Winged =C= name in the states.