Hello, all. I recently bought a used Tek T922 as a cheap, portable alternative to my main scope (an ancient but reliable RM35A). The 'scope arrived the other day and it appears to work OK except for intermittent vertical attenuator switches (a typical old 'scope problem) and one other problem that seems a bit weird. Instead of deflecting off the top or bottom of the screen, as it should, the trace will "squash" when you reach approximately to the top or bottom of the graticule. Obviously, this is bad, since it could lead you to believe that your waveform is clipping in the equipment under test. Is anyone familiar with what could be causing this problem? Unfortunately, I don't have a service manual for the 'scope.