Zenith 17z22q odd scanning

[Tube TV]

It is quite a interesting problem , I have not seen that one before .
However , I has a similar problem with my 1954 Crosley . with the Ion trap , but it was way way darker .
Im going to agree with electoking , and also say a shorted yoke .
It would most likely have keystone , but also appears to have a dead vertical oscillator or output section .

Old televisions will do almost anything when a recap is due , and it may not need a new yoke .
I would start with the caps , and go from there .
The CRT looks to be nice and bright , which makes it a bonus for restoring .
Im not sure about the availability of a NOS or used yoke , but someone will probably chime in that knows more about that than I do .

Best of luck with it .