Depairately seeking 1980's Sovtek 6922's

I'm going to re-tube my Modulus 3A which is currently tubed with 2 pairs of Sovtek 6922's from the 1980's. I really like this combination and would like to replace them with the same. However, I've had no luck at all finding this particular vintage. I've heard from lots of sources that the current production of these tubes under the name of Sovtek are no comparison to the 1980's production. After doing numerous searches and inquiries I've come up with zero. Does anybody have any leads or suggestions?