It seems this set is finicky about 6BG6s. After swapping four I found one it was happy with and no more raster loss.
Adjusting the controls resulted in a more stable image too. Still bypassing the tuner though.
I then moved on to troubleshooting the lack of sound. Feed an audio signal into the volume pot and got nice clear sound out of the speaker. Tried doing an alignment next and got nothing coming through. Eventually tracked it down to a dirty 2nd IF tube socket
Now back to the tuner. 2pF is the smallest cap I could find so I popped it in the tuner.
After some confusion with the counterclockwise channel numbering, I was able to tune something in
Tightening a loose connection finally produced a clear picture. Horizontal sync is really bad, but so glad to finally have video and sound
