Found a Capehart

[Eric H]

Originally Posted by kbmuri

Interesting thought that the beam might be magnetically deflected right off the face of the tube. My assumption was that powering down the set caused the gun to fire briefly, but that it wasn't firing otherwise. Guess it could be shooting sideways instead. I'll have to mull it over a bit. Thanks for the thought.

- k

I'm guessing it might be a video problem keeping the tube in cutoff till you switch the set off.

Another possibility is the tube is so weak you can't see it till the sweep collapses into a single spot.
Have you tried viewing the screen in a dark room?

Also, it wouldn't hurt to run a small magnet around the neck of the tube to see if you can pull the beam into place long enough to see if it's working.