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Unfortunately that isn't a yes or no question. Svetlana rebrands 6P15P type tubes (either "plain" 6P15P or 6P15P-EV or 6P15P-ER) and sells them as SV83. So one persons Svetlana SV83 could be (and probably is) very different from another's. My experience with buying Russian 6P15P type tubes is it is a crap shoot, some sound really good, others not so much with pretty much no rhyme or reason to it. FWIW they also test all over the map.

Back in the "good old days" (before the war) you could buy these tubes in quantity from the motherland for a few bucks each so it was a relatively small investment if you wanted to try out different tubes. Now that is no longer the case. I don't necessarily have anything against Svetlana, but if you want my advice it would be this:

If you just want new tubes for your UFO without any worry or hassle buy them from Decware. If you want to sample what other SV83/6P15Ps sound like I would buy them from ebay. They are still cheaper than Svetlana (as far as I can tell) and generally you know at least what version of 6P15P tube you are buying. But this just JMO/FWIW/YMMV.

P.S. There are many discussions of 6P15P/SV83 tubes in the various UFO fora as well as the Replacement Tube forum.

I was going to place this comment elsewhere, but if I can piggyback on JOMAN's point, it seems to fit here.

This year was one for tube rolling and experimentation for me. I have discovered favorites and a few others that could have been more remarkable. I liked the CryoTones in my system best when all was said and done. Others I found comparable were Genalex Gold Lion KT77 power tubes and 75C1 voltage regulator.

It took me some months to get here with this current set of tubes, but with the help of the folks at Wathen, I feel settled in for now. I went slow so I could ensure I could hear improvements with each tube pair purchased. I was encouraged by Don's offer that should I not hear an improvement; I could return that tube pair. The 5AR4-WC were the last two tubes added. As with the other CryoTone tubes that preceded them, they improved perceived sound quality and listening enjoyment.

I did have one unfortunate event while tube rolling; I blew out one of the 5AR4s. I was curious about what happened, attributing it to user error. I mentioned this to Don, and in the absence of any identifiable cause on my part, he offered to replace the tube free of charge. Since I needed a matched pair, I bought one, and he added the second. The surviving single 5AR4 went to the preamp. I didn't expect that, but I certainly appreciated it.

So here at year's end, if I had to make CryoTone tube purchases over again with what I know now, I would do it - only faster.