Hello group,
My ?new¡° 7613 has a X-deflection issue. See posted 2 photos about two weeks ago. The X-deflection seems to depend on the Y voltage. At higher Y voltages the X voltage seems to shift to a righter position (later in time). One photo shows staircase lines where you can clearly see the funny effect. With increasing Y voltage the lines start right (later) shifted. The second photo shows a square wave signal. The falling edges are tilted in ?negative¡° time direction. The 7613 therefore can measure/shows negative time! The rising edges are tilted in positive time direction. The rise time of the square wave therefore seems to be worser than it actually is.
I checked the X amplifier for any influences by the Y voltage, but everything seems to be ok. All calibration work and geometry settings are done. Nothing helped. It seems that deflection plates in the CRT are tilted, but this can happen only in the production process, or not? Any ideas what I can do to rescue the poor 7613 which is in an excellent condition otherwise.
Regards
Loetroelli
