Tube Health Indicators?

[vol.2]

Originally Posted by Yamamaya42

Rear most elements, nearest the pins, which has the cathodes in it.

Okay. I think I see what you mean.

I picked up this TV recently. It's a Sony from the early 70s, and it looks like total garbage. There's soot and dirty all over the inside, and there was goo all over the front of the tube and the faceplate.

I am wondering if it's even worth it to fix it up. The inside of the tube seems okay, at least it's not super discolored or anything. Is this the part that you mean?