Morris,
by shear coincidence I just got a 465B what sounds like the same problem with the CRT: a kink in the traces in the upper half of the screen. I had thought (and still do, until proven otherwise) that this must indicate some damage to the tube itself, probably to the scan expansion mesh. Hearing that another scope has a similar failure, however, makes me skeptical. Specifically, if two scopes had damaged expansion meshes I would expect the damage to be in different parts of the screen, rather than both affecting the upper half.
The distortion I am seeing affects both the vertical and horizontal axes. A level trace deforms in a wave-lake way as it moves higher up the screen, and a repetitive signal shows horizontal compression in regions of wave-like vertical displacement (I home that¡¯s comprehensible).
I don¡¯t have any advice, as I have barely begun to investigate this issue myself, but I wonder if the location in the upper half of the display tells us something important. Maybe it¡¯s a failure of one half of the vertical amplifier? I¡¯m having a hard time imagining what kind of damage or failure would cause the observed symptoms.
¡ª Jeff Dutky
