I decided to measure some voltages and do an eyeball comparison between the 10FP4 and my 5AXP4 test tube. The HV is somewhat low: 8KV versus 9.2KV given in the manual. Voltages on the 12AU7 video amp are normal. The two CRTs look like this, 5AXP4 first:
Not very scientific, but I was able to get a respectable picture from the 10FP4. Maybe I was being too critical before -- or I'm still learning how to adjust the neck gadgets.
I need to do some more poking around. There is some intermittent crashing (audio + video) whose source I haven't found. Maybe a leaky HV filter doorknob cap, or a tuner that needs a second cleaning? Anyway, I'm not giving on this 10FP4 just yet.
Regards,
Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html