Guidostrunk
Headphoneus Supremus
If you're interested. I have one pair left of my Voskod's. They're 1977 6n23p,Grey shields. I'm letting them go for $40 shipped for the pair.
I can't see any other markings or date code on the tubes. They do make the Lyr sound pretty decent to me at the moment, I don't have much experience with the tube amps. I can only compare the Lyr to the LD MK3 and EF2A that I have and the Lyr has the better sound.
I will probably going to get a pair of sub $100 Amperex or Voskhod and to compare them with the Pinnacle. Thank you so much for all the useful information.
Happy New Year.