CTC-4 Director 21

[miniman82]

Lack of height is nearly always drifted dropping resistors coming from B+boost so look at R119, the height pot, R117 and R118. If they all spec out, lower the value of R119 till the picture fills the screen. If I had to guess our vertical output transformers are going soft slowly, only solution is to feed them more voltage. Those are Sams resistors BTW.