I finally got back to working on this chassis
The ceramic HV cap on the damper tube has been replaced and a new HV anode lead installed.
I also installed a genuine Farnsworth 160AR CRT I stumbled across on craigslist.
It had no trace of any external coating but I did fine a ground spring on the chassis so it probably should have one. I went with a temporary one made from aluminum foil and tape
If I get it working, I'll coat it with some Slip Plate.
The old hardened tape was replaced wit some cloth tape.
While I had the brackets off, I finally found the chassis revision number - C-281.
TIme to fire it up again.