I have spent way too much time this week researching soviet tubes but at least I have a reference sheet to show for it. These are the tubes that seem to me to be the most interesting and commonly available through either NOS vendors or current production. Lots of interesting stuff here and many are still very cheap (<$5 USD). I’ve got a couple packages on the way already.
Soviet Tubes Reference (PDF with datasheet links)
wauwatosa tube factory 