well...the having a part in hand is just a matter of timing. I am cloning the Peerless S-230 for mine. I'll probably have a few taps put in so I can later use it with a pentode if I wish. I will hopefully have a serious distraction for my amp building in the future, hence the offer I made in the 'Vault' post below. Make the arrangements with Heyboer and the original will be delivered for unwinding. Don't worry, it is only a single that I acquired just for that purpose, and moving the schedule up so somebody else can benefit looks like a reasonable thing to do.
I am still contemplating a cathode driven PP 211 running near 1kV and using a 3k:500 as a PP:PP IT. Maybe drive with 6L6GC in E-Linear. Nice thing is the cathode is a fairly flat load to drive so a lot of NFB/damping factor won't be needed. Maybe after the 813 project...:)
cheers,
Douglas