The NFB/PFB split between the two phases is determined by this mu. I am going to determine if it should be minimum ( as in the 6AV5 with its 2A3-ish mu of 3.9 ) or maximum like the EF184's 60 mu.

I could build a 2A3 pentode, or try 12B4's for mu of 6.5, or go to the small power pentodes for mu of ~10. I also wonder if it makes a difference to go use for the E-Linear eciruit, or to use with a more traditional circuit as in Galahad.

I put a proper power TX in my stereo Merlin, and now it can run 100 mA per final and still have a lot of headroom.
cheers,
Douglas