Congratulations! I'm at almost to the same spot with my 9VT1 but still haven't got a raster
. I'm thinking my 8bp4 is bad but I'm not giving up yet! I also am wondering if my ballast tube could of came with a bad filament (same source as yours). I tried this morning and the horizontal is trying(you can hear the high pitch, and it changes as you turn the adjustment), no sound but I can't find channel 3 thus possibly no input and it may be my fault. Off to keep playing!
My understanding is that both the 7JP4 and 8BP4 are very difficult to test. I haven't attempted with my B&K 400, I don't have the correct tube socket adapter but can the Sencore units like Bandersen has do a decent job testing them? I think a while back he offered to help me test this CRT. Unfortunately finding time to do this is a ways off! Work, Sons Football, Daughters Softball, Wife working, etc., etc. LOL.
Congratulations Again, Its nice to know there at least a few of these old Moto's going within 50 miles of their headquaters!