Hmmm...apparently not. I am the proud owner of two Russian Dodo bird eggs.
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There are aplications for the 5881/6L6 but usually 4 are needed.
There is a guy from the UK on ebay selling them ( 6NC3 ) but he has like 100 of them :( So I don't think you have much of a chance selling them.
I tried many different 5881 tubes in my BAT VK5i when I had one. You might get lucky and find someone that has the BAT and is a crazy tube roller. As I recall the Russian NOS is slighty smoother than the new 5881 Sovtek, but has better bass than the new 5881 tubes on the market.