Charles:
Thank you. I believe there is guy at Wu Audio that is building a Korneff Replica. All I know is he is from Asia and copied the design. I think he goes by Wu?
I had some trouble with 300B tubes being microphonic with the long plates into a high efficiency designed speaker. The 45 tube has it all in musicality with great bass control for its output. If I were Ramoneo I would go that route as there is also some great NOS 45 tubes still out there. I still own 2 pair of RCA Globes and they are sweet as can be.
I can find out the builder if Mr. Ramoneo wants to know as I had a friend who had one built.