How Many Problems Can You Spot

[old_coot88]

Originally Posted by vts1134

The kinescope has been rebuilt and displays a much brighter picture than another one that I have. My other tube also has the same picture jumping when I rap on the neck of the tube, but it is no where near as dramatic as this one. The ripple at the right of the image is not present with the other kinescope.

From your account and from the video, the first thought is a H-K (heater-cathode) short in the CRT. Does the CRT heater have a dedicated 'floating' 6V winding, or does it run off the main heater supply?

There is a fair amount of picture smearing as well.

A H-K short can cause that too.

I think this will be cleared up with an alignment. Some one please correct me if I'm wrong on that.

Yikes! NO, nein, nyet! Not until alignment is absolutely determined to be the cause of the problem. Undertaking a video IF alignment requires a sweep generator and scope, and a thorough understanding of the procedure.

If this were your set on the bench where would you go next?

I would first eliminate the CRT as the culprit, and go from there. Could you post the CRT area of the schematic, and also the source of its heater supply?