ThurstonX
Headphoneus Supremus
My recollection - months old now - is that the "good" pair was really good. I preferred them to the '79s, which weren't bad at all. I don't want to tell tales out of school, as it was so long ago. My advice: if you ever come across a pair (or more; more are generally better where Russian tubes and Russian/Ukrainian sellers are concerned) for a reasonable price, do not hesitate, esp. now that others herein will be looking59s?! How do they sound?
I prefer the early 70s ones I have compared to the later ones I have. Not a huge difference, but they do seem to have a bit more of the character that I like.
I hope you like those Ken-Rad 6C8Gs. They are real purrty, and they sound damn fine, too.