Comment by ggm
1 year ago
I was told a pretty significant amount of hard RF leaks out the back of a tube. I wonder if its more, on a bigger one.
I was also surprised by how gentle the round off was. Sony did a decent job on the trinitron making tube front flat but it always pushed up against size. You gotta make it stable under a fair bit of vacuum.
RF is not an issue, but X-ray emission is indeed a problem that had to be confronted by TV engineers back in the day. A rule of thumb is that a color TV needs about 1 kV of acceleration voltage per diagonal inch. 43 kV is no joke when it comes to X-ray generation, so I'm curious if they found a way to make it work at a lower voltage.
At one point in the video you can see that the TV has two second-anode leads, so maybe that was the trick, using two separate acceleration electrodes at half the voltage.