Part of the problem might be that you do not have real Svetlanas.It is a long story.
Basically, the JSC Svetlana factory in Russia has lost the use of the "Svetlana" name in the USA.
The folks who now own the name in the USA also own the Xpo-pul factory, sometimes known as "Reflector". This is where the US tubes are now made as I understand it. As you note the folks who now own the name in the States also own Sovtec/Electro Harmonix.
Thus, you can get "Svetlana" tubes in the US that are not Svetlanas at all. The folks who own the name have decided to use it as a marketing name and, from a dollar and sense point of view, you cannot blame them as it is valuable. IMHO, It is not very honest though.
If you want true Svetlanas look for the "Winged C" on the tube and not the Svetlana name.
They are still being made in the traditional factory in St. Petersburg. They carry them at some places like Antique Electronic Supply.
Sincerely
I remain,
Basically, the JSC Svetlana factory in Russia has lost the use of the "Svetlana" name in the USA.
The folks who now own the name in the USA also own the Xpo-pul factory, sometimes known as "Reflector". This is where the US tubes are now made as I understand it. As you note the folks who now own the name in the States also own Sovtec/Electro Harmonix.
Thus, you can get "Svetlana" tubes in the US that are not Svetlanas at all. The folks who own the name have decided to use it as a marketing name and, from a dollar and sense point of view, you cannot blame them as it is valuable. IMHO, It is not very honest though.
If you want true Svetlanas look for the "Winged C" on the tube and not the Svetlana name.
They are still being made in the traditional factory in St. Petersburg. They carry them at some places like Antique Electronic Supply.
Sincerely
I remain,