Using rough numbers, foggy memory & I am NOT an engineer.........
Typical set horz tube draws 200ma at 400V so power is 80 watts.
IIRC a pair is used in home brew ham amps to give a solid 100W.
Waveform at horz out plate is DC with 1KV spikes on top of that
going +. ( DO NOT MEASURE !)
Spikes are very narrow at 15,750. Horz tube is running
very deep class C. The tube is biased off ( -60 to -90 on G-1 )
most of time.
You may want to get an RCA, GE or Sylvania tube manual to help.
Also as many of the same FBT's as you need so you only
engineer them once.
73 Zeno
LFOD !