Need help with a CTC-15 vertical problem!

[Turle]

I’m working on a ctc-15. Everything was going smoothly until I noticed that I can’t adjust the height at all. The picture looks squashed. The height pot is good. All the resistors in the circuit are good, I checked all of the capacitors. Swapped out the vertical output tube and nothing. The grid of the vertical output wants 30 volts, but jumps around between 3 and 5, adjusting the control only changes it by half a volt or so.

Would anyone know what could be causing this problem? I’ve been stuck on it for days now