I think the Tesla is better than the Sovteks, the Tesla is not at bright and cool in the mid and top end as the Sovtek. The Svetlana is good, but not as "European" sounding as the Tesla. The Tesla is more in the tonal range with the AEG Telefunken and the Siemens tubes. Really more to my liking, but that is why all these brands sell. You must have some basis of comparison to begin with, and then all the comments from everyone begin to make sense. By the way, I am not sure that you need Gold Aero selected versions of Tesla. The regular stock version is plenty good, and you will have enough money left over to buy spares.
