That 26R12 that I have shown above actually worked when I got it. But I did a complete restoration which included all paper and electrolytic capacitors and any tubes that were sub par. After it was running for a while, I heard a pop on the bench and lost half of the vertical height. And, the linearity was way off. And, this is what it looked like:
Long story short, it was "tin whiskers" on the height control. Boy, that was my first encounter and it was a bugger to find.
The pictures way above are the set when I got it. I have since gotten the correct color volume control knob. And the second picture is after I found and cleaned the height control. This set works very well with the BT modulator...