I would think Svetlana ( SED ) in St. Petersburg comes up first......I guess EL34 - KT88 etc.....I know some tube guys buy them in big lots and match them up for quads/pairs..for resale...
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Last I heard, there was some kind of distribution or ownership rights conflict regarding current Svetlana tubes. In the USA, the tubes that were the originally Svetlana are now sold under the "Winged C" or "Circled C" logo...I believe that current Svetlana tubes are in fact, really Sovtek tubes....at least as of a year or two ago.
I don't know what you have for testing gear, or your experience, but there are many tube suppliers with known reputation, and full tube lines [Yugo, China, Russia] and have access to supplies of NOS tubes as well.
I have no idea of the Custom forms and duty that might have to be considered for such an endeavor. Investigate all aspects CAREFULLY before making a decision!
Not really a hair brained idea!!! You're thinking of the "angles", and some day, it will pay off.
I don't know where you live, but check out yard sales for electronic gear. Learn, with research, to spot the few gems, buried in a sea of used turds! You'd be surprised what some people, who know nothing about audio, will let that old clunker go for...but you will know better!!! A quick check, a minor clean-up, and some few minor repairs can net quite a profit here on Agon or eBay [depending upon how good your find was].