I read somewherre tht the CFB, if kept to ~10% reduces third H a bit more than just that amount of nfb would from g2 current contributions. Even with the so-so Dynaco OPTx, and more than 10% it did not sound 'souless' or dry. The leakages caused some interesting behaviour with certain connections, and I decided to try something else.

Either way, it is only a pair of OPTx, probably ~$400/pr, and I may get the main plate TX wound so I can use it for both U-L @ 700V B+ or the full 1kV for pentode conection. But until I get some funding improvement( and keep the schedule open enough to build ), I am not having either one wound. I don't think I will be certain until I do it both ways anyway, so I'll probably get both done and stop wondering.
regards,
Douglas