Hello!
TWO monitors, same problem.
The first one: Sony multiscan E400, 19" chassis F99. This chassis is common
with those other CRT computer display:

IBM 6551 models
SONY E400/E400E/G400
COMPAQ P900
DELL P991

The second: Sony Multiscan E500, 21", G1 chassis. The same chassis of:

ELSA ECOMO730
SONY CPD-G500
COMPAQ P1110
DELL P1110
IBM 6552 models

The problem is the same: I noted a distorsion of the picture in the top
right corner of the image.
In the corner, the image is quite "smallest" than in the other part of the
monitor. It is like "pushed", and it is very out of convergence (only in
this point).
I know that is very difficult to find a solution of the problem without
seeing the monitor, but I think that someone could find a similar problem in
a similar screen.
Thank you!