about tubes svetlana winged c help

You might take this question and your photo to the tubes asylum on audio asylum. They have a bunch of very anal tube-o-philes who can answer your question.

The tubes in the photos are not even close to similar to the Svetlana tubes that I have which were purchased by me in the 90’s.

Firstly, there is no "Winged C" on the tube I have. Instead it has a stylized "S". Under this "S" appears this description:

Svetlana Electron
Devices Inc
EL34
Made in Russia
9639

I have other Svetlana tubes (KT 88’s) which were made after the sale of the Svetlana logo which had adopted the use of the "Winged C" logo, but this logo was in a fine print identical to my EL34’s and 6550’s made before the sale.

My guess is that these tubes are not original Svetlana tubes made in St Petersburg.

FWIW

An addendum to my previous post. I went into my stash of Svetlana EL34 and I found some which were made about 10 years after the ones I mentioned previously. They had the "Winged C" logo and in descending order the following:
EL34
Made In
Russia
0502
Totally different from those in the picture in the ad. Draw your own conclusions, but mine have not changed.

FWIW.