I must admit I made a mistake testing some of those octal tubes. They are weak but not quite as dead as I showed earlier.
I ended up replacing 8 tubes so far and it made a difference.
Noticed right away that the image was brighter. Still some ringing though.
Fed in a test pattern and was able to get a lock easily.
Bit of distortion in the upper-left and a shadow around the bottom. I think the focus coil has shifted out of position.
There is some odd interference in the image if you look close. I don't think it's just chroma dots.
Like watching through a screen window.