Yes those are all Russian tube equivalents of the 6SN7 family. I have bought from Ukraine several old stock Russian tube styles and most are very nice tubes for the money. Some can be very good and price doesn’t always go with SQ. If supply is good prices are low. My limited experience rank on the Russian factories are Melz (‘50’s 6n8s/1578), Reflector ( all tubes ‘50’s to early ‘70’s), Voskhod (6n23p/6922 ‘60’s to early ‘70’s), Foton (6n8s, 6P3s/6l6), I received some Nevz tubes with my tube preamp and amp and was not impressed but not much to gauge it on. I always look for good review history and test results to reduce risk. All but 1-2 tubes have worked, received replacements or refunds and tested close on my tester.
