Repairing a Motorola Cadet

[Billreed79]

Hello all!
I've been a lurker for a while and this is my first post.

I recently acquired a Motorola Cadet B&W portable, Chassis# D12TS-461A 01, that needs a little work. I've worked on old tube radios quite a bit (I have several of those), and tinkered with newer CRT monitors, but this is my first true effort in restoring an older TV.

The symptoms are: Sound is clear with no hum. I get a bright full-screen picture with static on a blank channel, but I can't get it to sync on a channel with programming. Picture gets torn into 4 strips and interlace is poor, as you can see in these images:
cadet1.jpg
cadet2.png

I bought the Sams for it, and things I've tried so far:
-Swapped all the Horizontal and vertical tubes, even though the Motorola tubes installed in the set tested good (might be the originals!)
-Replaced the two diodes in the AFC circuit.
Unfortunately, neither of these actions solved the problem.

Is anyone familiar with this set? Can you offer me any suggestions on what circuit or components I should look at next?

Any advice is appreciated. I'm excited to get this working again!

Thanks,
Bill