Hi Brian,
Velocity modulation of the X signal by trigger signals will appear as a non linear sawthooth signalx at the X amp output/X plates. However, the increasing/decreasing X sawthooth signals appear on a scope - at least optically - very linear. Above all, the horrible effect appears even with purely DC signals. That means variabel DC input levels appear without any voltage changes at the X output while the position of points or lines changes in X diection. Lower DC levels are displayed left shifted and higher DC levels appear right shifted/later in time. I also did tests with HF signals up to 200 MHz. The sine wave appears all over the frequency range like forest trees under stormy weather conditions: the trees appear tilted to the right side/later times while the roots are fixed. I really have no idea except tilted plated within the CRT. And I suppose that vacuum monsters have tileted the X plates in Walpurgis night...
Regards
Loetroelli
